Stock-based Awards (Details 2 - RSUs) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Weighted-Average Grant Date Fair Value
Stock based compensation expense	$ 4,487	$ 5,157	$ 7,985	$ 11,542
Non-vested restricted stock unit awards
Number of Shares
Non-vested at the beginning of period (in shares)			7,536,114
Granted (in shares)			6,514,994
Vested (in shares)			(1,626,096)
Canceled/forfeited (in shares)			(1,003,114)
Non-vested at the end of the period (in per share)	11,421,898		11,421,898
Weighted-Average Grant Date Fair Value
Non-vested at the beginning of period (in dollars per share)			$ 4.60
Granted (in dollars per share)			4.06
Vested (in dollars per share)			4.72
Canceled/forfeited (in dollars per share)			4.75
Non-vested at the end of the period (in dollars per share)	$ 4.26		$ 4.26
Remaining stock based compensation expense for non vested restricted stock units	$ 43,900		$ 43,900
Weighted average period over which remaining stock based compensation expense for unvested awards is expected to be recognized (in years)			3 years
Stock based compensation expense	$ 4,100	$ 4,200	$ 7,200	$ 8,900