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Fair Value Measurements - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain from change in fair value of convertible note embedded derivative liability | $ 0 | $ (1,476) | $ 0 | $ 1,096 |  |  |  |  |
Stock price (in dollars per share) | $ 7.13 | $ 1.83 | $ 7.13 | $ 1.83 | $ 6.45 | $ 3.78 | $ 1.24 | $ 2.01 |
Gain (loss) from change in fair value of warrant liability | $ (870) | $ (1,651) | $ (10,601) | $ 845 |  |  |  |  |
Convertible notes |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Original discount |  |  |  |  |  |  |  |  | $ 4,916

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