Income Taxes - Differences in Total Benefit from or Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax benefit at U.S. statutory rate	$ (3,100)	$ (2,631)
Change in valuation allowance	1,152	(410)
Stock-based compensation	686	1,786
Uncertain tax positions	663	154
State income taxes, net of federal benefit	(495)	(1,828)
Foreign income and withholding taxes	458	2,115
Other permanent differences	(196)	48
Provision to return adjustments	121	336
Impairment of goodwill		437
Research and development credits		151
Other		(278)
Benefit from income taxes	$ (711)	$ (120)