Quarterly report pursuant to Section 13 or 15(d)

Preferred Stock and Stockholders' Equity (Tables)

v3.19.1
Preferred Stock and Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Information regarding warrants for common stock outstanding and exercisable as of March 31, 2019 is as follows:
 
 
 
Warrants
 
 
 
 
 
Warrants
 
Exercise
 
Outstanding as of
 
 
Remaining
 
 
Exercisable as of
 
Price
 
March 31, 2019
 
 
Life (years)
 
 
March 31, 2019
 
 
 
 
 
 
 
 
 
 
 
$2.00
 
 
275,000
 
 
 
4.01
 
 
 
110,000
 
 $3.00 - $4.00
 
 
5,522,720
 
 
 
3.97
 
 
 
5,522,720
 
 $4.50 - $4.95
 
 
298,882
 
 
 
2.49
 
 
 
298,882
 
 $5.40 - $6.25
 
 
2,543,577
 
 
 
3.33
 
 
 
2,543,577
 
$10.35
 
 
1,634
 
 
 
2.04
 
 
 
1,634
 
$3.85
 
 
8,641,813
 
 
 
3.73
 
 
 
8,476,813