Accounts Receivable, Net - Schedule of Changes in Sales Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounts Receivable Net [Abstract]
Balance, beginning of period	$ (200)	$ (78)	$ (200)	$ (100)
Additions		(133)		(133)
Write-offs	5	2	5	24
Balance, end of period	$ (195)	$ (209)	$ (195)	$ (209)