Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Beginning balance	$ 6,890	$ 5,698	$ 2,604
Increases in tax positions for prior years	0	5	0
Decreases in tax positions for prior years	(579)	0	(196)
Increases in tax positions for current year	2,214	1,187	3,365
Lapse in statute of limitations	0	0	(75)
Ending Balance	$ 8,525	$ 6,890	$ 5,698