Basis of Presentation, Summary of Significant Accounting Policies and Recent Accounting Pronouncements - Loss Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	10,123,811	12,762,947
Options to purchase common stock
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	6,225,562	8,187,161
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)	503,395	1,658,205
Warrants to purchase common stock
Net Earnings per Share
Securities excluded from diluted loss per share calculation (in shares)	3,248,054	2,770,781