Stock-based Awards (Details 2 - RSUs) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Weighted-Average Grant Date Fair Value
Stock based compensation expense	$ 3,498	$ 6,385
Non-vested restricted stock unit awards
Number of Shares
Non-vested at the beginning of period (in shares)	7,536,114
Granted (in shares)	5,286,739
Vested (in shares)	(704,409)
Canceled/forfeited (in shares)	(628,698)
Non-vested at the end of the period (in per share)	11,489,746
Weighted-Average Grant Date Fair Value
Non-vested at the beginning of period (in dollars per share)	$ 4.60
Granted (in dollars per share)	4.24
Vested (in dollars per share)	4.66
Canceled/forfeited (in dollars per share)	4.91
Non-vested at the end of the period (in dollars per share)	$ 4.41
Remaining stock based compensation expense for non vested restricted stock units	$ 45,900
Weighted average period over which remaining stock based compensation expense for unvested awards is expected to be recognized (in years)	3 years 1 month 6 days
Stock based compensation expense	$ 3,100	$ 4,800

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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