Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail)

v3.21.1
Leases - Additional Information (Detail)
 3 Months Ended
Feb. 04, 2020
ft²
Jan. 22, 2020
ft²
Mar. 31, 2021
USD ($)
ft²
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2019
Lessee Lease Description [Line Items]            
Rent expense     $ 200 $ 200    
Lease Expiration Date     Dec. 31, 2025      
Operating lease, options to renew term     1 year      
Lessee, Operating Lease, Existence of Option to Extend [true false]     true      
Operating lease, right-of-use asset     $ 1,890,000   $ 1,976,000  
Operating Lease Right Of Use Asset Statement Of Financial Position [Extensible List]     Prepaid expenses and other current assets      
Operating Lease, Liability, Statement of Financial Position [Extensible List]     us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent      
Operating lease, liability     $ 2,026,000   $ 2,026,000  
Lease facility area | ft²   11,000 11,000      
Corona Lease [Member]            
Lessee Lease Description [Line Items]            
Lease term   5 years        
Lease Expiration Date     Jun. 30, 2025      
Lease Commencement Date   Jul. 01, 2020        
Foothill Ranch [Member]            
Lessee Lease Description [Line Items]            
Lease term 66 months          
Lease Commencement Date Jul. 01, 2020          
Lease facility area | ft² 11,000          
ASU 2016-02            
Lessee Lease Description [Line Items]            
Operating Lease Right Of Use Asset Statement Of Financial Position [Extensible List]           Prepaid expenses and other current assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]           Accrued liabilities
Minimum            
Lessee Lease Description [Line Items]            
Lease term     1 year      
Maximum            
Lessee Lease Description [Line Items]            
Lease term     5 years      
Lease initial term of contract     1 year