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Balance Sheets and Statements of Operations Components - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 41,350 $ 36,524
Less: accumulated depreciation and amortization (32,263) (25,744)
Total property and equipment, net 9,087 10,780
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 34,512 30,486
Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 3,518 3,197
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 862 860
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 2,295 1,780
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 163 $ 201