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Fair Value Measurements - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 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	$ 0	$ 1,620
Stock price (in dollars per share)	$ 5.00	$ 1.51	$ 3.50	$ 2.01	$ 1.51	$ 2.01
Change in fair value of warrant liability	$ 5,226	$ (1,570)
Convertible notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Original discount							$ 4,916

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- Definition

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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Price of a single share of a number of saleable stocks of a company.

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