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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 |  |  |

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