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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Year founded 2010    
Impairment of long-lived assets $ 0    
Accumulated deficit (196,092,000) $ (166,893,000)  
Net loss (29,199,000) (44,836,000) $ (39,612,000)
Equipment Financing Leases 499,000 393,000 $ 388,000
Current Liabilities 4,854,000 $ 6,945,000  
ATM Facility [Member]      
Property, Plant and Equipment [Line Items]      
Aggregate common stock offering value $ 50,000,000.0    
Cellectis [Member]      
Property, Plant and Equipment [Line Items]      
Percentage of ownership in outstanding common stock 61.80%