Annual report pursuant to Section 13 and 15(d)

Other Balance Sheet Details - Property and Equipment (Details)

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Other Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment , gross $ 3,390 $ 3,153  
Less accumulated depreciation and amortization (1,571) (2,781)  
Property and equipment, net 1,819 372  
Depreciation 200 200 $ 300
Lab and office equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross 1,067 2,248  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross 1,754 273  
Computer equipment and software      
Property, Plant and Equipment [Line Items]      
Property and equipment , gross $ 569 $ 632  
Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 10 years