Income Taxes - Differences in Total Benefit from or Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax benefit at U.S. statutory rate	$ (2,746)	$ (3,100)
Change in valuation allowance	4,547	1,152
Stock-based compensation	46	686
Uncertain tax positions	(194)	663
State income taxes, net of federal benefit	(1,223)	(495)
Foreign income and withholding taxes	(560)	458
Other permanent differences	52	(196)
Provision to return adjustments	(56)	121
Income tax benefit, net	$ (134)	$ (711)