Stockholders Equity - Additional Information (Detail)				12 Months Ended
	May 22, 2018 USD ($) $ / shares shares	Jul. 25, 2017 USD ($) $ / shares shares	Jun. 14, 2017 shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)
Stockholders Equity [Line Items]
Preferred stock share authorized | shares				50,000,000
Preferred stock share par value | $ / shares		$ 0.0001		$ 0.0001
Net proceeds from issuance of common stock upon IPO and exercise of overallotment		$ 58,000,000
Underwriting discounts and commissions		3,100,000
Offering expenses		$ 3,300,000
Net proceeds from issuance of common stock and exercise of overallotment				$ 344,000	$ 57,041,000	$ 57,980,000
Stock split ratio		0.0245	100
Common stock, shares authorized | shares			30,000,000	275,000,000	275,000,000
Authorised capital stock | shares		325,000,000
Common stock, shares designated | shares		275,000,000
Common stock, par value | $ / shares		$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares designated | shares		50,000,000
Repurchase of Common Stock				$ 813,000	$ 230,000
Cellectis [Member]
Stockholders Equity [Line Items]
Common stock, issued and sold | shares		2,500,000
Net proceeds from issuance of common stock and exercise of overallotment		$ 20,000,000
Outstanding obligation paid to parent		$ 5,700,000
IPO [Member]
Stockholders Equity [Line Items]
Common stock, issued and sold | shares		8,050,000
IPO price per share | $ / shares		$ 8.00
Underwriters Option to Purchase Additional Shares [Member]
Stockholders Equity [Line Items]
Common stock, issued and sold | shares	457,500	1,050,000
Follow-on Public Offering [Member]
Stockholders Equity [Line Items]
Common stock, issued and sold | shares	4,057,500
Underwriting discounts and commissions	$ 3,200,000
Offering expenses	700,000
Net proceeds from issuance of common stock and exercise of overallotment	$ 57,000,000
Common stock issued price per share | $ / shares	$ 15.00
Follow-on Public Offering [Member] | Cellectis [Member]
Stockholders Equity [Line Items]
Common stock, issued and sold | shares	550,000				550,000
Net proceeds from issuance of common stock and exercise of overallotment	$ 8,300,000
Outstanding obligation paid to parent	$ 57,000,000
Common stock issued price per share | $ / shares					$ 15.00