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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Common Stock Warrants Outstanding
As of March 31, 2019, the Company had these warrants outstanding:
Shares Underlying
Outstanding Warrants
 
Exercise Price
 
Expiration Date
2,906
 
$
120.40

 
December 1, 2021
3,737
 
$
120.40

 
December 6, 2021
17,190
 
$
60.50

 
January 8, 2020
6,500
 
$
10.00

 
April 4, 2026
3,720,500
 
$
3.00

 
February 15, 2023
3,750,833