Stock-based Compensation - Stock option activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Number of Shares, Outstanding	304,847
Number of Shares, Granted	20
Number of Shares, Outstanding	304,867	304,847
Number of Shares, Options vested	284,728
Weighted Average Exercise Price, Outstanding	$ 0.33
Weighted Average Exercise Price, Granted	0.77
Weighted Average Exercise Price, Outstanding	0.33	$ 0.33
Weighted Average Exercise Price, Options vested	$ 0.32
Weighted Average Remaining Contractual Life (in years), Outstanding	7 years 8 months 12 days	8 years
Weighted Average Remaining Contractual Life (in years), Granted	10 years
Weighted Average Remaining Contractual Life (in years), Options vested	7 years 8 months 12 days
Total Intrinsic Value, Outstanding	$ 114,803
Total Intrinsic Value, Granted	0
Total Intrinsic Value, Outstanding	114,803	$ 114,803
Total Intrinsic Value, Options vested	$ 108,032
Options
Number of shares, Vested	237,000,000