Accounts Receivable, Net - Schedule of Changes in Sales Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accounts Receivable Net [Abstract]
Balance, beginning of period	$ (209)	$ (116)	$ (100)	$ (45)
Additions		(24)	(133)	(104)
Write-offs	69	15	93	24
Balance, end of period	$ (140)	$ (125)	$ (140)	$ (125)