Capital Stock Transactions - Warrants (Details) - Warrant liability  | 
12 Months Ended | 
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| 
 Mar. 31, 2019  
$ / shares  
shares 
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| Number of Warrants Outstanding | |
| Outstanding, beginning balance (in shares) | shares | 4,536,857 | 
| Issued (in shares) | shares | 0 | 
| Exercised (in shares) | shares | (484,900) | 
| Canceled/Expired (in shares) | shares | (412,857) | 
| Outstanding, ending balance (in shares) | shares | 3,639,100 | 
| Weighted-Average Exercise Price | |
| Outstanding, beginning balance (in dollars per share) | $ / shares | $ 1.56 | 
| Issued (in dollars per share) | $ / shares | 0.00 | 
| Exercised (in dollars per share) | $ / shares | 1.36 | 
| Canceled/Expired (in dollars per share) | $ / shares | 3.43 | 
| Outstanding, ending balance (in dollars per share) | $ / shares | $ 1.37 | 
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised in Period, Weighted Average Exercise Price No definition available. 
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeited in Period, Weighted Average Exercise Price No definition available. 
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Grants in Period, Weighted Average Exercise Price No definition available. 
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price No definition available. 
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price [Roll Forward] No definition available. 
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- Definition Number of non-option equity instruments exercised by participants. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Net number of non-option equity instruments granted to participants. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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- Details 
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