Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summary of Stock Options and Changes During the Period (Details)

v3.19.1
Stockholders' Equity - Summary of Stock Options and Changes During the Period (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Number of Options, Beginning Balance 448,771 879,034
Number of Options, Granted 5,450,000  
Number of Options, Expired/Forfeited (32,692) (430,263)
Number of Options, Ending Balance 5,866,079 448,771
Number of Options Vested and Expected to Vest 5,866,079 448,771
Number of Options Vested and Exercisable 3,132,051 433,667
Weighted Average Exercise Price, Beginning Balance $ 15.50 $ 14.34
Weighted Average Exercise Price, Granted 0.58  
Weighted Average Exercise Price, Expired/Forfeited 10.71 13.13
Weighted Average Exercise Price, Ending Balance 1.67 15.50
Weighted Average Exercise Price, Options expected to vest 1.67 15.50
Weighted Average Exercise Price, Vested and Exercisable $ 2.58 $ 15.53
Weighted Average Remaining Contractual Life, Beginning Balance 6 years 2 months 23 days 6 years 9 months 14 days
Weighted Average Remaining Contractual Life, Granted 9 years 9 months 11 days  
Weighted Average Remaining Contractual Life, Ending Balance 9 years 5 months 27 days 6 years 2 months 23 days
Weighted Average Remaining Contractual Life, Options expected to vest 9 years 5 months 27 days 6 years 2 months 23 days
Weighted Average Remaining Contractual Life, Vested and Exercisable 9 years 2 months 30 days 6 years 1 month 27 days