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Commitments and Contingencies (Details)
ft² in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
supplier
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
ft²
supplier
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Operating Leases          
Long term deposit consisting of letter of credit serving as security for lease $ 603   $ 603   $ 603
Future minimum lease payments under non-cancelable operating leases          
2016 523   523    
2017 2,143   2,143    
2018 2,102   2,102    
2019 2,026   2,026    
2020 2,082   2,082    
Thereafter 11,956   11,956    
Total minimum lease payments 20,832   20,832    
Facilities rent expense $ 457 $ 687 $ 1,500 $ 1,300  
Supplies Purchase Commitments          
Number of suppliers | supplier 5   5    
Non-cancelable purchase commitment $ 1,500   $ 1,500    
Headquarters and laboratory facilities, South San Francisco, Lease signed April 2015          
Operating Leases          
Amount of space leased | ft²     59    
Security deposit 603   $ 603   603
Long term deposit consisting of letter of credit serving as security for lease 603   603   603
Laboratory facilities, Austin, Texas | Other assets          
Operating Leases          
Security deposit $ 75   $ 75   $ 75