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Commitments (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2010
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating Leases          
Initial term of the operating lease for office and laboratory space 5 years        
Extension term upon the completion of the initial lease term 5 years        
Rent expense   $ 300 $ 200 $ 600 $ 400
Future minimum payments required under the non-cancelable operating lease          
Remainder 2017   680   680  
2018   680   680  
Total minimum lease payments   $ 1,360   $ 1,360