Income Taxes - Loss Before Income Taxes, Income Tax, Provision, and Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss from continuing operations before income taxes:
Domestic	$ (10,513)	$ (9,034)	$ (18,147)
Foreign	1,982	(206)	(1,900)
Loss from continuing operations before income taxes	(8,531)	(9,240)	(20,047)
Provision for current income taxes:
U.S. federal	0	10	0
U.S. state and local	(26)	91	(2)
Foreign	556	97	154
Total provision for current income taxes	530	198	152
Benefit for deferred income taxes:
U.S. federal	0	(10)	(332)
U.S. state and local	0	0	0
Foreign	(54)	(198)	(167)
Total benefit for deferred income taxes	(54)	(208)	(499)
Total (benefit) provision for income taxes	$ 476	$ (10)	$ (347)
Reconciliation between the U.S. federal statutory income tax rate to the effective tax rate, by applying such rates to loss before income tax provision
U.S. federal statutory income tax rate (as a percent)	(21.00%)	(21.00%)	(34.00%)
State income tax rate, net of U.S. federal tax benefit (as a percent)	(0.25%)	0.77%	(0.01%)
Stock-based compensation expense (as a percent)	(11.36%)	(6.45%)	0.00%
Acquisition related costs (as a percent)	0.00%	0.00%	3.11%
Mark-to-market expense (as a percent)	0.00%	0.00%	0.25%
Change in income tax rates (as a percent)	2.40%	(6.33%)	(1.03%)
Change in deferred tax asset valuation (as a percent)	31.32%	34.08%	29.03%
Trademark income (as a percent)	0.00%	(1.54%)	0.00%
GILTI (as a percent)	3.55%	0.00%	0.00%
Goodwill impairment charge (as a percent)	0.00%	0.00%	1.46%
AMT credit (as a percent)	0.00%	0.00%	(1.65%)
Meals and Entertainment (as a percent)	0.89%	0.55%	1.10%
Other (as a percent)	0.03%	(0.20%)	0.01%
Effective tax rate (as a percent)	5.58%	(0.12%)	(1.73%)