Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

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Fair Value Measurements - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Mar. 31, 2017
Sep. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Change in fair value of convertible note embedded derivative liability   $ 3,344,000 $ 430,000 $ 4,652,000 $ 430,000      
Stock price (in dollars per share) $ 1.51 $ 1.51 $ 1.05 $ 1.51 $ 1.05 $ 1.03 $ 0.94 $ 0.99
Extinguishment of debt $ 6,000 $ 6,000            
Loss on extinguishment of debt       $ (1,628,000) $ (140,000)      
Change in fair value of warrant liability   1,164,000 $ 140,000 1,628,000 $ 140,000      
Convertible notes                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Original discount               $ 4,916,000
Debt face amount 10,000,000 $ 10,000,000   $ 10,000,000       $ 16,000,000
Interest rate               8.75%
Extinguishment of debt $ 3,800,000              
Convertible note embedded derivative liability                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Stock price (in dollars per share) $ 1.51 $ 1.51   $ 1.51        
Level 3 | Convertible note embedded derivative liability                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Loss on extinguishment of debt       $ 2,754,000