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Convertible Preferred Stock and Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Summary of Reserved Shares of Common Stock

The Company has reserved shares of common stock for conversion of convertible preferred stock, exercise of warrants, and the issuance of options granted under the Company’s stock option plan and its stock purchase plan as follows:

 

    December 31, 2018     December 31, 2017  
Warrants     1,131,151       38,779,119  
Series A Convertible Preferred Stock Series     47,844,562       47,844,562  
Stock award plans     4,438,503       5,573,046  
Employee Stock Purchase Plan     51,251       125,618  
      53,465,467       92,322,345  
Summary of Option and Stock Appreciation Rights Activity

A summary of the option and stock appreciation rights activity for the year ended December 31, 2018 is as follows:

 

    Number of
Options/SARs		     Range of
Exercise Price		     Weighted Average
Exercise Price
per Share		  
                   
Outstanding, December 31, 2017     413,301     $ 0.62 - $54.90     $ 9.04  
Granted     950,500     $ 0.74 - $1.07     $ 0.76  
Exercised     (2,916 )   $ 0.62     $ 0.62  
Forfeited     (195,799 )   $ 0.62 - $54.90     $ 7.66  
Outstanding, December 31, 2018     1,165,086     $ 0.74 - $43.90     $ 2.54  
Summary of Option and Stock Appreciation Rights Outstanding by Range of Exercise Price

A summary of the options and stock appreciation rights outstanding by range of exercise price is as follows:

 

    Year Ended December 31, 2018  
Range of Exercise Prices   Options Outstanding     Weighted
Average
Remaining Life		     Weighted
Average
Exercise Price		     Number of
Options
Currently Exercisable		     Weighted
Average Exercise
Price Per
Vested Share		  
                               
$0.00 - $1.00     818,500       9.18     $ 0.75       -     $ -  
$1.01 - $2.00     101,500       7.86     $ 1.48       51,718     $ 1.86  
$2.01- $4.00     115,791       6.11     $ 2.15       110,666     $ 2.15  
$4.01 - $10.00     86,500       5.24     $ 4.04       86,500     $ 4.04  
$10.01 - $20.00     -       -     $ -       -     $ 0.00  
$30.01 - $40.00     30,545       1.92     $ 34.74       30,545     $ 34.74  
$40.01 - $50.00     12,250       0.44     $ 43.90       12,250     $ 43.90  
      1,165,086       8.18      $ 2.54        291,679     $ 7.83  
Summary of Restricted Stock Unit Activity

A summary of the restricted stock unit activity for the year ended December 31, 2018 is as follows:

 

    Number of Restricted
Stock Units		     Weighted Average Grant
Date Fair Value per Unit		  
             
Outstanding, December 31, 2017     680,363     $ 1.11  
Granted     422,167     $ 0.80  
Vested     (385,606 )   $ 1.24  
Forfeited     (69,275 )   $ 1.12  
Outstanding, December 31, 2018     647,649     $ 0.83