Background and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Sales revenues	$ 0	$ 3,235	$ 0	$ 15,573
Sales cost of revenues	0	3,455	0	14,990
Services revenues	56,317	37,795	118,919	77,547
Services cost of revenues	17,042	12,606	38,438	26,481
Other current assets	7,571		7,571		$ 21,014	[1]
Accounts receivable	8,750		8,750		10,451	[1]
Accumulated deficit	$ (383,754)		$ (383,754)		(371,328)	[1]
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Sales revenues		(100)		(500)
Sales cost of revenues		(300)		(700)
Services revenues		100		500
Services cost of revenues		$ 300		$ 700
Other current assets					(1,200)
Accounts receivable					$ 1,200

[1] Derived from audited consolidated financial statements as of and for the year ended December 31, 2016.