Income Taxes - Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current tax expense (benefit)
Federal	$ (17)	$ 234	$ 0
State	93	(10)	109
Foreign	112	823	278
Total current tax expense (benefit)	188	1,047	387
Deferred tax expense (benefit)
Federal	315	317	99
State	171	153	55
Foreign	(866)	(367)	(554)
Total deferred tax expense (benefit)	(380)	103	(400)
Total income tax provision (benefit)	$ (192)	$ 1,150	$ (13)