Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details 2)

v3.19.2
Stockholders' Equity (Details 2) - Common Stock Warrants [Member]
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Balance at beginning | shares 8,676,481
Issued | shares
Exercised | shares (315,745)
Expired / Terminated | shares (29,754)
Balance at ending | shares 8,330,982
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Balance at beginning | $ / shares $ 4.17
Issued | $ / shares
Exercised | $ / shares 2.20
Expired / Terminated | $ / shares 41.55
Balance at ending | $ / shares $ 4.12