Stock Option and Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Jan. 01, 2023	Dec. 31, 2015	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	May 17, 2022	Dec. 31, 2021	Jul. 28, 2014	Apr. 29, 2014	Feb. 24, 2014	Feb. 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan			7,127,939		7,127,939		2,795,645
Number of common stock shares outstanding			79,582		79,582		55,565
Weighted average grant date fair value of options				$ 24	$ 5.02	$ 244.8
Unrecognized compensation cost related to unvested stock options			$ 2.2		$ 2.2
Weighted average period of unvested stock options					1 year 8 months 12 days
Options, granted			0
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized			$ 0.7	$ 1.0	$ 2.4	$ 2.9
Amended and Restated 2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan													1,964
Termination of service, Period					2 years
2008 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan											2,946	2,321
Termination of service, Period					10 years
2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan										715
Number of additional shares increases of common stock reserved pursuant to the plan	77,157
2014 Omnibus Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase of plan, percentage of common stock shares outstanding		4.00%
2021 Employment Inducement Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan									12,500
Two Thousand and Twenty Two Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved pursuant to the plan								10,000
Number of common stock shares outstanding			0		0
Discount rate from fair value on offering date that participants pay for shares.					85.00%

CONTRAFECT Corp 10-Q