Income Taxes - Schedule of the Change in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning of year	$ 1,307	$ 1,202
Additions based on tax positions related to the current year	193	105
Reductions for tax positions of prior years	(79)	0
Balance at end of year	$ 1,421	$ 1,307