Summary of Significant Accounting Policies - Accumulated Other Comprehensive Loss (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	$ 139,050	$ 153,612	$ 72,116
Change during the year	(1,019)	694	105
Ending balance	94,596	139,050	153,612
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	112	(618)
Change during the year	(1,019)	730
Ending balance	(907)	112	(618)
Unrealized Gain (Loss) on Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	36
Change during the year	0	(36)
Ending balance	0	0	36
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	112	(582)	(687)
Change during the year	(1,019)	694	105
Ending balance	$ (907)	$ 112	$ (582)