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License, Collaboration, and Funding Agreements - Additional Information (Detail) - USD ($)		1 Months Ended			3 Months Ended			12 Months Ended
	Oct. 31, 2018	Feb. 28, 2017	Dec. 31, 2016	Aug. 31, 2014	Dec. 31, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Collaboration License And Funding Arrangements [Line Items]
Upfront payments	$ 92,000
Common Stock issued							22,000
Research and Development Expense							$ 0
Research and development expense						$ 5,655,000	4,744,000
AUSTRIA [Member]
Collaboration License And Funding Arrangements [Line Items]
Grant income						14.00%
Genzyme Agreement [Member]
Collaboration License And Funding Arrangements [Line Items]
Upfront payments				$ 50,000
Cash payment				$ 300,000
Common Stock issued				107,371
Equity reverse stock split				Adjusted for the 6 for 1 reverse stock split and exchange ratio
Research and Development Expense				$ 734,000
Shares issued price per share				$ 0.01
Future milestone payments						$ 25,000,000
Consideration paid to equity shareholders						5.50%
Derivative Liability						$ 0		$ 183,000
License agreement termination description						The agreement may be terminated by either party with at least 90 days' notice in the event of material breach by the other party that remains uncured for 90 days, by either party for insolvency or bankruptcy of the other party, immediately by Genzyme if the Company challenges the licensed patents, or immediately by the Company if a material safety issue arises.
Payment on obligation under license agreement						$ 0	0
Milestone payment obligation						0	0
Georgetown Agreement [Member]
Collaboration License And Funding Arrangements [Line Items]
License agreement termination description					The event (i) the Company fails to pay any amount and fails to cure such failure within 30 days after receipt of notice, (ii) the Company defaults in its obligation to obtain and maintain insurance and fails to remedy such breach within 45 days after receipt of notice, or (iii) the Company declares insolvency or bankruptcy. The Company may terminate the agreement at any time upon at least 60 days' written notice.
Payment on obligation under license agreement						0	0
Milestone payment obligation						0	0
One time upfront payment			$ 50,000
Milestone payments			800,000
BIDMC Agreement [Member]
Collaboration License And Funding Arrangements [Line Items]
License agreement termination description					The event (i) the Company fails to pay any amount and fails to cure such failure within 15 days after receipt of notice, (ii) the Company is in material breach of any material provision of the agreement and fails to remedy such breach within 60 days after receipt of notice, or (iii) the Company declares insolvency or bankruptcy. We may terminate the agreement at any time upon at least 90 days' written notice.
Payment on obligation under license agreement						0	$ 0
One time upfront payment			$ 20,000
Adimab Option Agreement [Member]
Collaboration License And Funding Arrangements [Line Items]
Future milestone payments		$ 25,000,000
Option fee		250,000
Adimab Option Agreement [Member] | Adimab, LLC [Member]
Collaboration License And Funding Arrangements [Line Items]
Future milestone payments						24,400,000
Option fee						300,000
Research and development expense						0
Adimab Collaboration Agreement | Adimab, LLC [Member]
Collaboration License And Funding Arrangements [Line Items]
Research and development expense						0
Research and Development Incentive [Member]
Collaboration License And Funding Arrangements [Line Items]
Grant receivable						1,600,000
Grant Agreement [Member]
Collaboration License And Funding Arrangements [Line Items]
Qualifying expenses related to letter agreement						$ 0
February 2017 Grant Agreement | Gates Foundation [Member]
Collaboration License And Funding Arrangements [Line Items]
Grant receivable		$ 9,300,000
Janssen License and Option Agreement [Member] | Janssen Pharmaceuticals Incorporation [Member]
Collaboration License And Funding Arrangements [Line Items]
Payables from related parties								3,500,000
Payment received from related parties								$ 3,500,000
License and options agreement description								Pursuant to the Janssen License and Option Agreement, Arsanis granted to Janssen (i) a non-exclusive license to specified patents in Arsanis’s portfolio related to the ASN200 E. coli program, and (ii) an option for Janssen to acquire these patents in the future if specified conditions are met. Janssen agreed to pay Arsanis $3.5 million within 15 business days after the December 12, 2018 effective date of the Janssen License and Option Agreement, in addition to a future $0.5 million payment in the event Janssen exercises its option to acquire the relevant patents. Arsanis received the $3.5 million payment from Janssen in December 2018.
Janssen License and Option Agreement [Member] | Janssen Pharmaceuticals Incorporation [Member] | Patents [Member]
Collaboration License And Funding Arrangements [Line Items]
Option to acquire the relevant patents								$ 500,000

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