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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Organization and Description of Business (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 29, 2020	Dec. 31, 2019	Dec. 31, 2018
Nature of Operations
Product revenue		$ 0
Accumulated deficit		(260,370)	$ (241,551)
Cash and cash equivalents		34,479	$ 7,851
Perceptive \| Senior secured delayed draw term loan facility \| Perceptive Credit Agreement, Tranche One
Nature of Operations
Amount borrowed		5,000
Perceptive \| Senior secured delayed draw term loan facility \| Perceptive Credit Agreement, Tranche Two
Nature of Operations
Amount borrowed		$ 15,000
Subsequent Event \| Perceptive \| Senior secured delayed draw term loan facility \| Perceptive Credit Agreement
Nature of Operations
Maximum borrowing capacity	$ 35,000
Subsequent Event \| Perceptive \| Senior secured delayed draw term loan facility \| Perceptive Credit Agreement, Tranche One
Nature of Operations
Amount borrowed	5,000
Subsequent Event \| Perceptive \| Senior secured delayed draw term loan facility \| Perceptive Credit Agreement, Tranche Two
Nature of Operations
Amount borrowed	$ 15,000