Stock-Based Compensation and Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 10, 2020	Jan. 28, 2020	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted during period (in shares)						239,275
Stock compensation expense (benefit)				$ 1,921	$ 580	$ 3,892	$ (5,484)
Stock issued under employee stock purchase plan (in shares)				149,865		149,865
Warrants outstanding (in shares)				9,400,000		9,400,000		10,500,000
Number of shares of common stock to be issued for upon exercise of warrants (in shares)				5,200,000		5,200,000		5,800,000
Warrant, exercise price (in usd per share)				$ 24.39		$ 24.39		$ 24.39
Number of warrants exercised during period (in shares)				1,011,224	0	1,011,424	0
Proceeds from warrant exercises				$ 13,700		$ 13,700
Purchase of treasury stock (in shares)	800,000	1,000,000.0	800,000	0		0
Purchase of treasury stock	$ 9,200	$ 12,600	$ 8,800		$ 8,856		$ 30,626
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price of options exercised during period (in usd per share)						$ 3.68
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price of options exercised during period (in usd per share)						$ 13.82
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense (benefit)				$ 1,600	$ 600	$ 3,200	$ (5,500)
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense (benefit)				$ 400		$ 700
Purchase price, after discount						85.00%
Stock available for purchase under ESPP (in shares)				2,000,000		2,000,000