Accounts Receivable, Net - Schedule of Changes in Sales Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounts Receivable Net [Abstract]
Balance, beginning of period	$ (200)	$ (100)
Additions	0
Write-offs	0	22
Balance, end of period	$ (200)	$ (78)