Accounts Receivable, Net - Schedule of Changes in Sales Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounts Receivable Net [Abstract]
Balance, beginning of period	$ (78)	$ (125)	$ (100)	$ (45)
Additions	(133)		(133)	(80)
Write-offs	2	9	24	9
Balance, end of period	$ (209)	$ (116)	$ (209)	$ (116)