Accounts Receivable, Net - Schedule of Accounts Receivable Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts Receivable Net [Abstract]
Accounts receivable	$ 52,980		$ 41,818
Allowance for doubtful accounts	(1,156)	$ (1,051)	(711)	$ (820)	$ (716)	$ (863)
Net accounts receivable	$ 51,824		$ 41,107