Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Balance at beginning of the year	$ 2,400	$ 1,565	$ 308
Additions for taxes positions related current year	55	1,088	848
Additions for taxes positions related to prior years	372	58	409
Reduction related to lapse of applicable statute of limitations		(311)
Balance at the end of the year	$ 2,827	$ 2,400	$ 1,565