Restatement of Previously Issued Unaudited Interim Condensed Consolidated Financial Statements (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, net	$ 16,249	$ 16,432	$ 30,794	$ 34,095
Cost of revenues	11,465	8,395	20,790	15,124
Selling, general and administrative expenses	5,727	4,706	11,087	9,005
Total costs and expenses	21,159	18,214	39,235	32,910
Operating income (loss)	(4,910)	(1,782)	(8,441)	1,185
Partial extinguishment of Convertible 3.75% Senior Notes	(2,467)	0	(2,467)	0
(Loss) income before income tax expense	(13,096)	(896)	(17,874)	18
Net loss	$ (13,119)	$ (919)	$ (17,921)	$ (88)
Basic and diluted loss per share (in dollars per share)	$ (0.25)	$ (0.02)	$ (0.34)	$ 0.00
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, net	$ 16,751		$ 31,296
Cost of revenues	11,728	$ 10,371	21,053	$ 19,328
Selling, general and administrative expenses	5,961		11,321
Total costs and expenses	21,656	20,190	39,732	37,114
Operating income (loss)	(4,905)		(8,436)
Partial extinguishment of Convertible 3.75% Senior Notes	(10,069)		(10,069)
(Loss) income before income tax expense	(20,693)		(25,471)
Net loss	$ (20,716)		$ (25,518)
Basic and diluted loss per share (in dollars per share)	$ (0.39)		$ (0.48)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, net	$ (502)		$ (502)
Cost of revenues	(263)	1,976	(263)	4,204
Selling, general and administrative expenses	(234)		(234)
Total costs and expenses	(497)	$ 1,976	(497)	$ 4,204
Operating income (loss)	(5)		(5)
Partial extinguishment of Convertible 3.75% Senior Notes	7,602		7,602
(Loss) income before income tax expense	7,597		7,597
Net loss	$ 7,597		$ 7,597
Basic and diluted loss per share (in dollars per share)	$ 0.14		$ 0.14