Income Taxes - Provision for Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ (10)	$ (20)	$ (39)
Foreign	168	141	193
Total	158	121	154
Deferred:
Federal	0	(211)	(73)
State	(18)	12	15
Foreign	549	692	188
Total	531	493	130
Total tax expense	$ 689	$ 614	$ 284