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Balance Sheets and Statements of Operations Components - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 46,331 $ 42,823
Less: accumulated depreciation and amortization (37,414) (33,920)
Total property and equipment, net 8,917 8,903
Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 39,128 35,836
Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 3,801 3,548
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 857 864
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 2,536 2,492
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 9 $ 83