XML 79 R61.htm IDEA: XBRL DOCUMENT v3.20.4
Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2020
Feb. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Office Space and Research Facilities Lease        
Commitment And Contingencies [Line Items]        
Operating leases, rent expense     $ 1.2 $ 1.0
Lease expiration date     Dec. 31, 2025  
Supply Agreement [Member]        
Commitment And Contingencies [Line Items]        
Payments for inventory     $ 0.3  
Supply Agreement [Member] | Maximum        
Commitment And Contingencies [Line Items]        
Purchase of inventory $ 2.0      
Office Space Lease Agreement        
Commitment And Contingencies [Line Items]        
Operating lease maturity year   2025