Income Taxes - Components of (Loss) Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ (39,390)	$ (19,092)	$ (9,820)
International	(158)	(113)	(159)
Loss before benefit from (provision for) income taxes	$ (39,548)	$ (19,205)	$ (9,979)