Stockholders' Equity - Stock Options Activities (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Number
Options outstanding, Balance (in shares) | shares	803,870
Granted (in shares) | shares	0
Exercised (in shares) | shares	(3,208)
Forfeited and expired (in shares) | shares	0
Options outstanding, Balance (in shares) | shares	800,662	803,870
Weighted average exercise price
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 7.077
Granted, weighted average exercise price (in dollars per share) | $ / shares	0
Exercised, weighted average exercise price (in dollars per share) | $ / shares	7.123
Forfeited and expired, weighted average exercise price (in dollars per share) | $ / shares	0
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 7.077	$ 7.077
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable at the end of the year (in shares) | shares	786,922
Options exercisable at the end of the year, weighted average exercise price (in dollars per share) | $ / shares	$ 7.101
Options outstanding, aggregate intrinsic value | $	$ 32,397	$ 33,524
Options exercisable at the end of the year, aggregate intrinsic value | $	$ 31,822
Options outstanding, weighted average remaining contractual life (Year)	2 years 6 months	2 years 9 months
Options exercisable at the end of the year, weighted average remaining contractual life (Year)	2 years 4 months 28 days