Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Valuation allowance	$ 40,485	$ 38,321
Change in valuation allowance	2,200	6,000
Net deferred tax asset	778	$ 643
Operating loss carryforwards without expiration	$ 35,400
Restricted Stock Units and Performance Share Units
Shares granted calculation, grant period (in days)	50
Foreign Tax Authority
Net deferred tax asset	$ 800
Domestic Tax Authority
Net operating loss carryforward	75,900
Domestic Tax Authority | Internal Revenue Service (IRS) | Research Tax Credit Carryforward
Tax credit carryforward	6,900
State and Local Jurisdiction
Net operating loss carryforward	39,300
State and Local Jurisdiction | California Franchise Tax Board | Research Tax Credit Carryforward
Tax credit carryforward	$ 8,500