Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plans - Employee Stock Purchase Plan - Additional Information (Detail)

v3.20.2
Stock-Based Compensation Plans - Employee Stock Purchase Plan - Additional Information (Detail)
9 Months Ended
Sep. 30, 2020
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Common stock shares available for issuance 4,931,055
Unrecognized stock-based compensation expense | $ $ 27,219,000
Unrecognized stock-based compensation expenses recognition period 3 years 6 months 29 days
Employee Stock Purchase Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Length of purchase intervals 6 months
ESPP discount rate 10.00%
Initial Common stock reserved 366,667
Common stock shares available for issuance 188,550
Unrecognized stock-based compensation expense | $ $ 30,000
Unrecognized stock-based compensation expenses recognition period 1 month 17 days
Employee Stock Purchase Plan - Annual Available for Issuance Share Increase [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Common stock available for future issuance authorized annual share increase 366,667
Common stock available for future issuance authorized annual percentage increase 1.00%