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Related Party Transactions - Additional Information (Details)		1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 09, 2020 USD ($) $ / shares shares	Nov. 30, 2017 TargetAntigen	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Related Party Transaction [Line Items]
Rent expense incurred under operating lease			$ 42,000	$ 42,000	$ 84,000	$ 84,000
Gross proceeds from issuance of common stock					2,349,000
Subsequent Event \| July 2020 Stock Purchase Agreement \| Friedberg Global-Macro Hedge Fund, Ltd
Related Party Transaction [Line Items]
Sale of stock, transaction date	Jul. 09, 2020
Subsequent Event \| July 2020 Stock Purchase Agreement \| Friedberg Global-Macro Hedge Fund, Ltd \| Common Stock
Related Party Transaction [Line Items]
Number of common stock sold \| shares	1,126,760
Shares issued, price per share \| $ / shares	$ 3.55
Gross proceeds from issuance of common stock	$ 4,000,000
Surface Oncology, Inc.
Related Party Transaction [Line Items]
Number of target antigens against which antibodies are to be identified and selected \| TargetAntigen		2
Service fee payment received			$ 0	$ 25,000	$ 0	$ 118,877