Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Abstract]
Federal income tax at statutory rates	$ (9,136)	$ (9,117)
State income taxes, net of federal income tax benefits	(2,125)	(2,249)
Permanent items:
Foreign inclusions	45	1,104
Other permanent differences	673	585
Rate differential on foreign income	(67)	262
Valuation allowance	5,960	3,667
Provision to return adjustments	2,005	182
Impact of CARES Act	(1,134)
Other	765	667
Income tax benefit	$ (3,014)	$ (4,899)
Effective income tax benefit rate	6.90%	11.30%