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Fair Value Measurements - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	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	$ 0	$ 952	$ 0	$ 2,572
Stock price (in dollars per share)	$ 6.45	$ 1.24	$ 6.45	$ 1.24	$ 5.00	$ 3.50	$ 1.51	$ 2.01
Gain (loss) from change in fair value of warrant liability	$ (4,505)	$ 926	$ (9,731)	$ 2,496
Convertible notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Original discount									$ 4,916

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Amount, after accumulated amortization, of debt discount.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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