Income Taxes - Schedule of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current tax provision:
Federal	$ (2,636)	$ 0	$ 1
State	104	74	(3)
Foreign	1,476	3,096	1,693
Total current tax provision	(1,056)	3,170	1,691
Deferred tax provision:
Federal	0	(49)	(16)
State	0	0	0
Foreign	(462)	(2,128)	(1,337)
Total provision for (benefit from) income taxes	$ (1,518)	$ 993	$ 338