Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Operating Leases (Details)

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Commitments and Contingencies - Operating Leases (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2015
ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Operating leases      
Area of office and laboratory space leased | ft² 21,488    
Term of option to extend the lease   5 years  
Rent expense   $ 882,000 $ 320,000
Operating leases future minimum payments      
2017   1,252,000  
2018   1,288,000  
2019   1,325,000  
2020   1,130,000  
Operating leases future minimum payments   4,995,000  
Restricted Cash      
Operating leases      
Original letter of credit   $ 483,000 $ 483,000