Accounts Receivable, Net - Schedule of Accounts Receivable Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts Receivable Net [Abstract]
Accounts receivable	$ 43,451		$ 41,818
Allowance for doubtful accounts	(1,051)	$ (810)	(711)	$ (716)	$ (637)	$ (863)
Net accounts receivable	$ 42,400		$ 41,107