Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Net Loss per Share (Details)

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Significant Accounting Policies - Net Loss per Share (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 8,304,230 7,902,780
Warrants (Note 6)    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,104,705 4,241,321
Stock options (Note 6)    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 200,000 110,000
Unvested restricted stock (Note 6)    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,999,525 3,551,459