| Guarantor and Non-Guarantor Financial Statements - Cash Flow Statement (Details) - USD ($)$ in Thousands
 | 3 Months Ended | 6 Months Ended | 
| Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | 
| Cash flows from operating activities |  |  |  |  | 
| Net loss | $ (7,341) | $ (8,322) | $ (14,753) | $ (16,441) | 
| Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  | 
| Depreciation and amortization |  |  | 4,199 | 6,850 | 
| Loss on disposal of fixed assets |  |  | 0 | 23 | 
| Change in allowance for doubtful accounts |  |  | 7 | 3 | 
| Amortization of debt discount |  |  | 237 | 236 | 
| Amortization of debt issuance costs |  |  | 444 | 0 | 
| Accrued interest |  |  | (91) | (16) | 
| Stock-based compensation |  |  | 2,310 | 2,524 | 
| Stock-based compensation for services rendered |  |  | 166 | 600 | 
| Change in fair value of convertible note embedded derivative liability |  |  | 430 | 0 | 
| Change in fair value of derivative instruments |  |  | 140 | 0 | 
| Loss on extinguishment of debt | 293 | 0 | 293 | 0 | 
| Stock issued for settlement of liability |  |  | 0 | 283 | 
| (Increase) / decrease in assets: |  |  |  |  | 
| Restricted cash transferred to / (from) operating cash |  |  | (321) | 200 | 
| Accounts receivable |  |  | 35 | (2,313) | 
| Deposits |  |  | 61 | (1) | 
| Deferred tax assets |  |  | 99 | 0 | 
| Deferred financing costs |  |  | 0 | (187) | 
| Prepaid expenses and other current assets |  |  | 68 | 243 | 
| Increase / (decrease) in liabilities: |  |  |  |  | 
| Accounts payable |  |  | 4,771 | 5,177 | 
| Accrued license fees and revenue share |  |  | (1,009) | 2,336 | 
| Accrued compensation |  |  | (280) | (597) | 
| Other current liabilities |  |  | (393) | (585) | 
| Other non-current liabilities |  |  | 20 | 0 | 
| Net cash used in operating activities |  |  | (3,567) | (1,665) | 
| Cash flows from investing activities |  |  |  |  | 
| Capital expenditures |  |  | (1,115) | (610) | 
| Net cash used in investing activities |  |  | (1,115) | (610) | 
| Cash flows from financing activities |  |  |  |  | 
| Cash received in convertible notes issuance |  |  | 16,000 | 0 | 
| Repayment of debt obligations |  |  | (11,000) | (300) | 
| Payment of debt issuance costs |  |  | (2,091) | 0 | 
| Options exercised |  |  | 11 | 49 | 
| Warrant exercised |  |  | 0 |  | 
| Net cash provided / (used) in financing activities |  |  | 2,920 | (251) | 
| Effect of exchange rate changes on cash and cash equivalents |  |  | (53) | 39 | 
| Net change in cash and cash equivalents |  |  | (1,815) | (2,487) | 
| Cash and cash equivalents, beginning of period |  |  | 11,231 | 7,069 | 
| Cash and cash equivalents, end of period | 9,416 | 4,582 | 9,416 | 4,582 | 
| Eliminations |  |  |  |  | 
| Cash flows from operating activities |  |  |  |  | 
| Net loss | 0 | 0 | 0 | 0 | 
| Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  | 
| Depreciation and amortization |  |  | 0 | 0 | 
| Loss on disposal of fixed assets |  |  |  | 0 | 
| Change in allowance for doubtful accounts |  |  | 0 | 0 | 
| Amortization of debt discount |  |  | 0 | 0 | 
| Amortization of debt issuance costs |  |  | 0 |  | 
| Accrued interest |  |  | 0 | 0 | 
| Stock-based compensation |  |  | 0 | 0 | 
| Stock-based compensation for services rendered |  |  | 0 | 0 | 
| Change in fair value of convertible note embedded derivative liability |  |  | 0 |  | 
| Change in fair value of derivative instruments |  |  | 0 |  | 
| Loss on extinguishment of debt | 0 |  | 0 |  | 
| Stock issued for settlement of liability |  |  |  | 0 | 
| (Increase) / decrease in assets: |  |  |  |  | 
| Restricted cash transferred to / (from) operating cash |  |  | 0 | 0 | 
| Accounts receivable |  |  | 0 | 0 | 
| Deposits |  |  | 0 | 0 | 
| Deferred tax assets |  |  | 0 |  | 
| Deferred financing costs |  |  |  | 0 | 
| Prepaid expenses and other current assets |  |  | 0 | 0 | 
| Increase / (decrease) in liabilities: |  |  |  |  | 
| Accounts payable |  |  | 0 | 0 | 
| Accrued license fees and revenue share |  |  | 0 | 0 | 
| Accrued compensation |  |  | 0 | 0 | 
| Other current liabilities |  |  | 0 | 0 | 
| Other non-current liabilities |  |  | 0 |  | 
| Net cash used in operating activities |  |  | 0 | 0 | 
| Cash flows from investing activities |  |  |  |  | 
| Capital expenditures |  |  | 0 | 0 | 
| Net cash used in investing activities |  |  | 0 | 0 | 
| Cash flows from financing activities |  |  |  |  | 
| Cash received in convertible notes issuance |  |  | 0 |  | 
| Repayment of debt obligations |  |  | 0 | 0 | 
| Payment of debt issuance costs |  |  | 0 |  | 
| Options exercised |  |  | 0 | 0 | 
| Warrant exercised |  |  | 0 |  | 
| Net cash provided / (used) in financing activities |  |  | 0 | 0 | 
| Effect of exchange rate changes on cash and cash equivalents |  |  | 0 | 0 | 
| Net change in cash and cash equivalents |  |  | 0 | 0 | 
| Cash and cash equivalents, beginning of period |  |  | 0 | 0 | 
| Cash and cash equivalents, end of period | 0 | 0 | 0 | 0 | 
| Parent | Reportable Legal Entities |  |  |  |  | 
| Cash flows from operating activities |  |  |  |  | 
| Net loss | (3,552) | (1,333) | (7,882) | (5,495) | 
| Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  | 
| Depreciation and amortization |  |  | 5 | 2,408 | 
| Loss on disposal of fixed assets |  |  |  | 23 | 
| Change in allowance for doubtful accounts |  |  | 0 | 0 | 
| Amortization of debt discount |  |  | 0 | 0 | 
| Amortization of debt issuance costs |  |  | 0 |  | 
| Accrued interest |  |  | 0 | 0 | 
| Stock-based compensation |  |  | 2,310 | 2,524 | 
| Stock-based compensation for services rendered |  |  | 166 | 600 | 
| Change in fair value of convertible note embedded derivative liability |  |  | 430 |  | 
| Change in fair value of derivative instruments |  |  | 140 |  | 
| Loss on extinguishment of debt | 293 |  | 293 |  | 
| Stock issued for settlement of liability |  |  |  | 283 | 
| (Increase) / decrease in assets: |  |  |  |  | 
| Restricted cash transferred to / (from) operating cash |  |  | 0 | 200 | 
| Accounts receivable |  |  | 17 | 0 | 
| Deposits |  |  | 0 | 8 | 
| Deferred tax assets |  |  | 99 |  | 
| Deferred financing costs |  |  |  | (187) | 
| Prepaid expenses and other current assets |  |  | (49) | 46 | 
| Increase / (decrease) in liabilities: |  |  |  |  | 
| Accounts payable |  |  | 233 | 114 | 
| Accrued license fees and revenue share |  |  | 0 | 0 | 
| Accrued compensation |  |  | 582 | (977) | 
| Other current liabilities |  |  | 1,539 | (345) | 
| Other non-current liabilities |  |  | (1,004) |  | 
| Net cash used in operating activities |  |  | (3,121) | (798) | 
| Cash flows from investing activities |  |  |  |  | 
| Capital expenditures |  |  | (3) | 0 | 
| Net cash used in investing activities |  |  | (3) | 0 | 
| Cash flows from financing activities |  |  |  |  | 
| Cash received in convertible notes issuance |  |  | 0 |  | 
| Repayment of debt obligations |  |  | 0 | 0 | 
| Payment of debt issuance costs |  |  | 0 |  | 
| Options exercised |  |  | 11 | 49 | 
| Warrant exercised |  |  | 0 |  | 
| Net cash provided / (used) in financing activities |  |  | 11 | 49 | 
| Effect of exchange rate changes on cash and cash equivalents |  |  | (53) | 39 | 
| Net change in cash and cash equivalents |  |  | (3,166) | (710) | 
| Cash and cash equivalents, beginning of period |  |  | 6,712 | 4,156 | 
| Cash and cash equivalents, end of period | 3,546 | 3,446 | 3,546 | 3,446 | 
| Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  | 
| Cash flows from operating activities |  |  |  |  | 
| Net loss | (3,682) | (6,273) | (6,832) | (9,730) | 
| Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  | 
| Depreciation and amortization |  |  | 3,616 | 3,994 | 
| Loss on disposal of fixed assets |  |  |  | 0 | 
| Change in allowance for doubtful accounts |  |  | 7 | 0 | 
| Amortization of debt discount |  |  | 237 | 236 | 
| Amortization of debt issuance costs |  |  | 444 |  | 
| Accrued interest |  |  | (91) | (16) | 
| Stock-based compensation |  |  | 0 | 0 | 
| Stock-based compensation for services rendered |  |  | 0 | 0 | 
| Change in fair value of convertible note embedded derivative liability |  |  | 0 |  | 
| Change in fair value of derivative instruments |  |  | 0 |  | 
| Loss on extinguishment of debt | 0 |  | 0 |  | 
| Stock issued for settlement of liability |  |  |  | 0 | 
| (Increase) / decrease in assets: |  |  |  |  | 
| Restricted cash transferred to / (from) operating cash |  |  | (321) | 0 | 
| Accounts receivable |  |  | 325 | (2,276) | 
| Deposits |  |  | 17 | (8) | 
| Deferred tax assets |  |  | 0 |  | 
| Deferred financing costs |  |  |  | 0 | 
| Prepaid expenses and other current assets |  |  | 108 | 188 | 
| Increase / (decrease) in liabilities: |  |  |  |  | 
| Accounts payable |  |  | 4,562 | 5,085 | 
| Accrued license fees and revenue share |  |  | (1,219) | 2,317 | 
| Accrued compensation |  |  | (765) | 365 | 
| Other current liabilities |  |  | 61 | (1,000) | 
| Other non-current liabilities |  |  | (617) |  | 
| Net cash used in operating activities |  |  | (468) | (845) | 
| Cash flows from investing activities |  |  |  |  | 
| Capital expenditures |  |  | (1,092) | (610) | 
| Net cash used in investing activities |  |  | (1,092) | (610) | 
| Cash flows from financing activities |  |  |  |  | 
| Cash received in convertible notes issuance |  |  | 16,000 |  | 
| Repayment of debt obligations |  |  | (11,000) | (300) | 
| Payment of debt issuance costs |  |  | (2,091) |  | 
| Options exercised |  |  | 0 | 0 | 
| Warrant exercised |  |  | 0 |  | 
| Net cash provided / (used) in financing activities |  |  | 2,909 | (300) | 
| Effect of exchange rate changes on cash and cash equivalents |  |  | 0 | 0 | 
| Net change in cash and cash equivalents |  |  | 1,349 | (1,755) | 
| Cash and cash equivalents, beginning of period |  |  | 4,466 | 2,827 | 
| Cash and cash equivalents, end of period | 5,815 | 1,072 | 5,815 | 1,072 | 
| Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  | 
| Cash flows from operating activities |  |  |  |  | 
| Net loss | (107) | (715) | (39) | (1,216) | 
| Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |  |  | 
| Depreciation and amortization |  |  | 578 | 448 | 
| Loss on disposal of fixed assets |  |  |  | 0 | 
| Change in allowance for doubtful accounts |  |  | 0 | 3 | 
| Amortization of debt discount |  |  | 0 | 0 | 
| Amortization of debt issuance costs |  |  | 0 |  | 
| Accrued interest |  |  | 0 | 0 | 
| Stock-based compensation |  |  | 0 | 0 | 
| Stock-based compensation for services rendered |  |  | 0 | 0 | 
| Change in fair value of convertible note embedded derivative liability |  |  | 0 |  | 
| Change in fair value of derivative instruments |  |  | 0 |  | 
| Loss on extinguishment of debt | 0 |  | 0 |  | 
| Stock issued for settlement of liability |  |  |  | 0 | 
| (Increase) / decrease in assets: |  |  |  |  | 
| Restricted cash transferred to / (from) operating cash |  |  | 0 | 0 | 
| Accounts receivable |  |  | (307) | (37) | 
| Deposits |  |  | 44 | (1) | 
| Deferred tax assets |  |  | 0 |  | 
| Deferred financing costs |  |  |  | 0 | 
| Prepaid expenses and other current assets |  |  | 9 | 9 | 
| Increase / (decrease) in liabilities: |  |  |  |  | 
| Accounts payable |  |  | (24) | (22) | 
| Accrued license fees and revenue share |  |  | 210 | 19 | 
| Accrued compensation |  |  | (97) | 15 | 
| Other current liabilities |  |  | (1,993) | 760 | 
| Other non-current liabilities |  |  | 1,641 |  | 
| Net cash used in operating activities |  |  | 22 | (22) | 
| Cash flows from investing activities |  |  |  |  | 
| Capital expenditures |  |  | (20) | 0 | 
| Net cash used in investing activities |  |  | (20) | 0 | 
| Cash flows from financing activities |  |  |  |  | 
| Cash received in convertible notes issuance |  |  | 0 |  | 
| Repayment of debt obligations |  |  | 0 | 0 | 
| Payment of debt issuance costs |  |  | 0 |  | 
| Options exercised |  |  | 0 | 0 | 
| Warrant exercised |  |  | 0 |  | 
| Net cash provided / (used) in financing activities |  |  | 0 | 0 | 
| Effect of exchange rate changes on cash and cash equivalents |  |  | 0 | 0 | 
| Net change in cash and cash equivalents |  |  | 2 | (22) | 
| Cash and cash equivalents, beginning of period |  |  | 53 | 86 | 
| Cash and cash equivalents, end of period | $ 55 | $ 64 | $ 55 | $ 64 |