Preferred Stock and Stockholders' Equity - Change in Preferred Stock Carrying Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	$ 93,012
Accrual of in-kind dividends	13,000
Ending balance	105,086	$ 93,012
Series B Convertible Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	93,012	0
Gross proceeds from issuance of shares	0	100,000
Relative fair value of Warrants issued	0	(1,076)
Recognition of bifurcated embedded derivative	0	(2,295)
Allocation of issuance costs to Preferred Stock	0	(4,259)
Accrual of in-kind dividends	11,121	590
Amortization and other	953	52
Ending balance	$ 105,086	$ 93,012