Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.20.2
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Accumulated Deficit $ 968,926 $ 817,961