Basis of Presentation, Summary of Significant Accounting Policies and Recent Accounting Pronouncements - Loss Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Earnings per Share
Securities excluded from diluted loss per share calculation	12,762,947	7,286,001
Employee stock options
Net Earnings per Share
Securities excluded from diluted loss per share calculation	8,187,161	6,806,001
Restricted stock awards
Net Earnings per Share
Securities excluded from diluted loss per share calculation	146,800	480,000
Restricted stock units
Net Earnings per Share
Securities excluded from diluted loss per share calculation	1,658,205
Warrants
Net Earnings per Share
Securities excluded from diluted loss per share calculation	2,770,781