Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 369,669	$ 245,059	$ 522,801
Amounts arising during the period		(457)	702
Reclassification adjustments		7	(326)
Ending balance	178,971	369,669	245,059
Net Unrealized Gains (Losses) on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	189	379	3
Amounts arising during the period	(202)	(197)	702
Reclassification adjustments		7	(326)
Ending balance	(13)	189	379
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(260)	0	0
Amounts arising during the period	288	(260)	0
Reclassification adjustments		0	0
Ending balance	28	(260)	0
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(71)	379	3
Amounts arising during the period	86
Ending balance	$ 15	$ (71)	$ 379