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Fair Value Measurements - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | 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 | $ 952 | $ (3,344) | $ 2,572 | $ (4,652) |  |  |  |  |
Stock price (in dollars per share) | $ 1.24 | $ 1.51 | $ 1.24 | $ 1.51 | $ 1.51 | $ 2.01 | $ 1.03 | $ 0.94 |
Change in fair value of warrant liability | $ 926 | $ (1,164) | $ 2,496 | $ (1,628) |  |  |  |  |
Convertible notes |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Original discount |  |  |  |  |  |  |  |  | $ 4,916
Convertible note embedded derivative liability |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Stock price (in dollars per share) | $ 1.24 |  | $ 1.24 |  |  |  |  |  |

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