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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 |  |  |  |

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