Property and Equipment, net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 776	$ 5,876
Accumulated depreciation and amortization	(776)	(4,888)
Total property and equipment		988
Less assets held for sale		(911)
Property and equipment, net		77
Equipment, Computer Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	314	5,005
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	350	433
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 112	$ 438