Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share (Schedule of Antidilutive Securities) (Details)

v3.19.1
Net Loss Per Share (Schedule of Antidilutive Securities) (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee stock options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities 465,303 266,810
Unvested restricted stock units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities 56,520 21,779
Common Stock Warrant [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities 9,030,730 310,397