Stockholders' Equity - AOCI Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in the balances of each component of AOCI
Balance at the beginning of the period	$ 408,374	$ 374,512	$ 437,775
Other comprehensive income (loss)	(363)	(48)	74
Balance at the end of the period	437,628	408,374	374,512
Accumulated Other Comprehensive Income
Changes in the balances of each component of AOCI
Balance at the beginning of the period	1,846	1,894	1,820
Other comprehensive income (loss)	(363)	(48)	74
Balance at the end of the period	1,483	1,846	1,894
Translation adjustment
Changes in the balances of each component of AOCI
Balance at the beginning of the period	1,866	1,861	1,836
Other comprehensive income (loss)	(52)	5	25
Balance at the end of the period	1,814	1,866	1,861
Unrealized gain on available for sale securities
Changes in the balances of each component of AOCI
Balance at the beginning of the period	(20)	33	(16)
Other comprehensive income (loss)	(311)	(53)	49
Balance at the end of the period	$ (331)	$ (20)	$ 33