Correction to Previously Issued Consolidated Financial Statements - Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, net	$ 16,777	$ 18,294	$ 16,249	$ 14,545	$ 14,767	$ 11,340	$ 16,432	$ 17,663	$ 65,865	$ 60,202	$ 63,012
Cost of revenues										32,830	28,325
Total costs and expenses									$ 80,964	71,999	60,470
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, net										67,251	66,881
Cost of revenues										39,879	32,194
Total costs and expenses										79,048	64,339
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, net										(7,049)	(3,869)
Cost of revenues										(7,049)	(3,869)
Total costs and expenses										$ (7,049)	$ (3,869)