Basis of Presentation, Summary of Significant Accounting Policies and Recent Accounting Pronouncements - Summary of Potentially Dilutive Securities (Details) - shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	32,719,054	33,501,260
Options to purchase common stock
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	5,871,620	6,682,192
Unvested restricted stock awards
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	78,300	146,800
Unvested restricted stock units
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	342,271	245,405
Warrants to purchase common stock
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	26,426,863	26,426,863