Summary of Significant Accounting Policies - Equity Instruments (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Warrant expense	$ (2,807)	$ (1,496)	$ (1,017)	$ (1,193)	$ (6,513)
Previously Reported
Warrant expense	$ (2,807)	(4,583)	(1,483)	(4,179)	(13,052)
Restatement adjustment
Warrant expense		$ 3,087	$ 466	$ 2,986	$ 6,539