Net Loss Per Share Of Common Stock, Basic And Diluted - Anti-dilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Anti-dilutive securities
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding	0	0
Stock options
Anti-dilutive securities
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding	2,812,006	1,849,359	959,188
Non-participating warrants on common stock
Anti-dilutive securities
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding	4,661,145	7,400,934	7,400,934
Underwriters' unit purchase option
Anti-dilutive securities
Anti- dilutive securities excluded from the computation of diluted weighted shares outstanding	40,000	40,000	40,000