Restatement of Financial Statements (Details 6) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ 8,982	$ 2,703	$ 9,070	$ 6,554
Provision for bad debt			1,738	0
Accounts receivable			(4,960)	(3,168)
Accounts payable and accrued expenses			4,006	2,356
Net cash (used in) provided by operating activities			(2,660)	2,820
Cash and cash equivalents at end of period	38,231	$ 74,632	38,231	$ 74,632
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	6,328		6,416
Provision for bad debt			0
Accounts receivable			(5,764)
Accounts payable and accrued expenses			3,894
Net cash (used in) provided by operating activities			(2,660)
Cash and cash equivalents at end of period	38,231		38,231
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	2,654		2,654
Provision for bad debt			1,738
Accounts receivable			804
Accounts payable and accrued expenses			112
Net cash (used in) provided by operating activities			0
Cash and cash equivalents at end of period	$ 0		$ 0