Basis of Presentation, Summary of Significant Accounting Policies and Recent Accounting Pronouncements - Loss Per Share (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	33,501,260	12,412,135
Options to purchase common stock
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	6,682,192	8,170,382
Unvested restricted stock awards
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	146,800	146,800
Unvested restricted stock units
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	245,405	1,324,172
Warrants to purchase common stock
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	26,426,863	2,770,781