Stock-Based Compensation and Stockholders’ Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Beginning balance (in shares)	9,879,240
Granted (in shares)	0	0	454,100
Exercised (in shares)	(2,202,895)	0	0
Forfeited (in shares)	(24,938)
Ending balance (in shares)	7,651,407	9,879,240
Exercisable (in shares)	7,480,088
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 1.93
Granted (in dollars per share)	0
Exercised (in dollars per share)	1.62
Forfeited (in dollars per share)	11.15
Ending balance (in dollars per share)	1.99	$ 1.93
Exercisable (in dollars per share)	$ 1.79
Aggregate grant date fair value, outstanding at December 31, 2020	$ 10,000
Issued, aggregate grant date fair value	0
Exercised, aggregate grant date fair value	(2,000)
Forfeited, aggregate grant date fair value	0
Aggregate grant date fair value, outstanding at December 31, 2021	8,000	$ 10,000
Aggregate grant date fair value, exercisable	$ 7,000