Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.8.0.1
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Commitments And Contingencies Disclosure [Abstract]      
Operating leases expiration period 2022-12    
Square Feet of Office and Laboratory | ft² 51,000    
Rent expenses $ 4.7 $ 4.2 $ 1.9
Purchase commitments expiration year 2020    
Capital lease expiration year 2020    
Weighted average interest rates 5.20%    
Base salaries of officers $ 2.5