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Selected Quarterly Financial Data (Unaudited) - Effect of Restatement on Consolidated Statement of Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accrued expenses	$ 2,432	$ 1,891	$ 3,242	$ 3,041	$ 8,867	$ 6,099	$ 6,029	$ 15,709	$ 1,085	$ 5,096
Prepaid expenses and other assets	(1,624)	(207)	1,238	(1,261)	(1,359)	(2,443)	(2,284)	(12,893)	2,126	(3,224)
Net cash provided by operating activities	8,097	13,910	1,322	24,511	(13,542)	24,313	(7,695)	32,282	(22,815)	(15,094)
Net cash used in investing activities	(1,896)	(1,099)	(2,424)	489	(3,611)	(1,065)	(5,165)	(1,651)	(43,805)	(52,322)
Net cash used in financing activities	(8,151)	(19,761)	(1,190)	(33,010)	14,861	(30,083)	10,568	(36,784)	68,504	67,671
Decrease in cash		(6,950)
Cash at beginning of the year	2,292	8,445	2,292	8,445	2,292	8,445	2,292	8,445	6,561	6,306
Cash at end of the year	342	1,495	0	435	0	1,610		2,292	8,445	6,561
Other noncurrent liabilities	$ 121	98	$ 894	(1,011)	$ 821	(1,028)	$ (5,260)	1,601	8,107	(232)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by operating activities		9,995							(23,049)	(15,685)
Net cash used in investing activities		(214)							(43,570)	(51,713)
Net cash used in financing activities		(16,731)							68,503	67,653
Decrease in cash		(6,950)
Cash at beginning of the year		8,445		8,445		8,445		8,445	6,561	6,306
Cash at end of the year		1,495							8,445	$ 6,561
Restatement Adjustments and Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash provided by operating activities		3,915
Net cash used in investing activities		(885)
Net cash used in financing activities		(3,030)
Decrease in cash		0
Cash at beginning of the year		0		$ 0		$ 0		$ 0
Cash at end of the year		$ 0							$ 0