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Commitments and Contingencies (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2015
ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 08, 2017
USD ($)
Future minimum lease payments under non-cancelable operating leases          
2017   $ 2,143      
2018   2,102      
2019   2,026      
2020   2,082      
2021   2,144      
Thereafter   9,812      
Total minimum lease payments   20,309      
Facilities rent expense   2,000 $ 1,900 $ 852  
Supplies Purchase Commitments          
Non-cancelable purchase commitment   1,700      
Headquarters and laboratory facilities, South San Francisco, Lease signed in April 2015          
Operating Leases          
Amount of space leased | ft² 59        
Security deposit   603      
Laboratory facilities, Austin, Texas          
Operating Leases          
Security deposit   $ 75 $ 75    
Subsequent event | Headquarters and laboratory facilities, South San Francisco, Lease signed in April 2015          
Operating Leases          
Lease Modification, Consideration Received         $ 500