Net Loss per Share - Potential dilutive securities excluded from the computation of diluted net loss per share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Loss per Share
Warrants to purchase common stock	19,044	19,044	19,044	19,044
Unvested restricted stock	197,900		197,900
Stock options to purchase common stock	5,030,441	4,058,046	5,030,441	4,058,046
Total	5,247,385	4,077,090	5,247,385	4,077,090