Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Operating Leases (Details)

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Commitments and Contingencies - Operating Leases (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Jan. 08, 2019
ft²
Mar. 31, 2015
ft²
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Operating lease, right of use asset     $ 1,308  
Operating lease liability     1,957  
Rent expense     200 $ 200
Accounting Standards Update 2016-02        
Operating lease, right of use asset     1,500  
Operating lease liability     $ 2,200  
Operating ​Lease, ​March 2015        
Area of office and laboratory space leased | ft² | ft²   21,488    
Term of option to extend the lease     5 years  
Operating Lease, January 2019        
Area of office and laboratory space leased | ft² | ft² 52,859      
Term of option to extend the lease     10 years  
Letter of credit outstanding     $ 3,100