Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue
Collaboration and license revenue	$ 2,848		$ 4,875
Revenue from Contract with Customer, Products and Services [Extensible List]	http://www.tscan.com/#CollaborationAndLicenseRevenueMember	http://www.tscan.com/#CollaborationAndLicenseRevenueMember	http://www.tscan.com/#CollaborationAndLicenseRevenueMember	http://www.tscan.com/#CollaborationAndLicenseRevenueMember
Operating expenses:
Research and development	$ 10,801	$ 4,502	$ 18,140	$ 8,800
General and administrative	2,726	1,114	5,332	2,452
Total operating expenses	13,527	5,616	23,472	11,252
Loss from operations	(10,679)	(5,616)	(18,597)	(11,252)
Other income:
Interest income	5	3	11	102
Net loss	$ (10,674)	$ (5,613)	$ (18,586)	$ (11,150)
Net loss per share, basic and diluted	$ (7.69)	$ (6.18)	$ (14.25)	$ (13.23)
Weighted average common shares outstanding—basic and diluted	1,387,973	908,564	1,303,899	842,643