Quarterly report pursuant to Section 13 or 15(d)

Contractual Commitments - Additional Information (Detail)

v3.19.3
Contractual Commitments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Commitments [Line Items]        
Operating lease expense $ 721   $ 1,951  
Upfront fees unamortized balance included in prepaid asset 1,000   1,000  
Contractual obligation 41,000   $ 41,000  
Percentage of right to share development costs exercised     50.00%  
Minimum        
Other Commitments [Line Items]        
Estimated purchase obligation 1,000   $ 1,000  
Maximum        
Other Commitments [Line Items]        
Estimated purchase obligation 1,900   1,900  
Facilities Operating Leases        
Other Commitments [Line Items]        
Operating lease expense $ 700 $ 400 $ 2,000 $ 1,000