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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of Common Stock Warrants Outstanding
As of June 30, 2019, the Company had the following 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
 
$
0.98
 
February 15, 2023
3,750,833