Income Taxes - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
State	$ 2	$ 4	$ 5
Foreign	301		1,204
Total current	303	4	1,209
Deferred:
Federal			(30)
Total deferred			(30)
Provision for (benefit from) income taxes	$ 303	$ 4	$ 1,179