Basis of Presentation and Summary of Significant Accounting Policies - Rollforward (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Warrant liability		$ 4,011		$ 4,011		$ 0
Issuance of warrants, January 2020	$ 1,636	103		15
Settlements from exercise				(52)
Loss from change in fair value of warrants		$ 3,300	$ 0	$ 2,427	$ 0

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

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of the liabilities, classified as other, for deferred compensation arrangements payable within one year or the operating cycle, if longer.

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Value of preferred stock and warrants for common stock issued.

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