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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Summary of common and preferred stock authorized, issued and outstanding
The following is a summary of the Company's authorized and issued common and preferred stock as of March 31, 2018 and December 31, 2017:
 
 
 
 
 
Outstanding as of
 
Authorized
 
Issued
 
March 31,
2018
 
December 31, 2017
Common Stock, par value $0.001 per share
600,000,000

 
90,704,931

 
90,704,931

 
90,357,644

Series C Preferred Stock, par value $0.001 per share
1,091

 
1,091

 
23

 
23
Summary of warrants outstanding
The following table summarizes the warrants outstanding as of March 31, 2018 and December 31, 2017:
 
 
 
 
 
 
 
As of March 31, 2018
 
As of December 31, 2017
Issued in Connection With:
 
Exercise
Price
 
Expiration
Date
 
Number of
Warrants Outstanding
 
Common Stock
Warrant Liability
 
Number of
Warrants Outstanding
 
Common Stock
Warrant Liability
March 2013 financing
 
$
3.17

 
September 12, 2018
 
284,091

 
$
488,636

 
284,091

 
$
360,795

Total
 
 
 
 
 
284,091

 
$
488,636

 
284,091

 
$
360,795