Basis of Presentation, Summary of Significant Accounting Policies and Recent Accounting Pronouncements - Loss Per Share (Details) - shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net Earnings per Share
Securities excluded from diluted loss per share calculation	12,412,135	9,488,655
Employee stock options
Net Earnings per Share
Securities excluded from diluted loss per share calculation	8,170,382	8,048,105
Restricted stock awards
Net Earnings per Share
Securities excluded from diluted loss per share calculation	146,800	146,800
Restricted stock units
Net Earnings per Share
Securities excluded from diluted loss per share calculation	1,324,172	1,293,750
Warrants
Net Earnings per Share
Securities excluded from diluted loss per share calculation	2,770,781