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Leases, Other Commitments, and Contingencies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]        
Lease term 20 years      
Number of lease extension options 4      
Extension term of lease agreement 5 years      
Proceeds from sale of land and uncompleted facility   $ 7,000,000.0    
Percentage of annual base rent 8.00%      
Increase in percentage of annual base rent on the sixth, eleventh and sixteenth anniversaries 7.50%      
Annual base rent $ 1,400,000      
Restricted cash 393,000   $ 388,000 $ 381,000
Forward purchase noncancelable commitments amount 21,200,000      
Cellectis [Member]        
Other Commitments [Line Items]        
Minimum net worth required $ 300,000,000      
Cellectis [Member] | Maximum [Member]        
Other Commitments [Line Items]        
Threshold percentage of ownership in outstanding common stock to enact indemnification agreement 50.00%      
Corporate Headquarters [Member]        
Other Commitments [Line Items]        
Office and lab building area | ft² 40,000      
Option to extend true      
Option to extend, description The lease has a term of twenty years with four options to extend its term for five years each subject to there being no default under the lease terms beyond any cure period and us occupying the property at the time of extension.      
Equipment [Member]        
Other Commitments [Line Items]        
Lease term 4 years      
Option to extend true      
Option to extend, description The equipment financing arrangement allows for a six-month renewal option or a repurchase option at the end of the lease term.      
Extension term of lease agreement 6 months      
Restricted cash $ 1,000,000.0