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Equity Awards
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Equity Awards
Warrants
In connection with sales of the Company's common stock and the issuance of debt instruments that have since been repaid, warrants were issued. The warrants expire between one and seven years from issuance from the date of grant and are subject to the terms applicable in each agreement. The following table sets forth the changes in the number of warrants outstanding for the periods presented:
        
 
Number of
Warrants
 
Weighted Average
Exercise Price
Outstanding at December 31, 2016
2,148,741

 
$
11.04

Exercised
(1,181,235
)
 
3.64

Forfeited, Canceled
(257,332
)
 
50.76

Outstanding at December 31, 2017
710,174

 
8.95

Exercised
(18,405
)
 
3.00

Forfeited, Canceled
(163,715
)
 
3.34

Outstanding at December 31, 2018
528,054

 
$
10.90


During April 2017, warrant holders exercised 1,181,235 warrants for 292,668 shares of the Company's common stock through cashless exercise. The fair value of the warrants exercised was valued using the Black Scholes option pricing model based on the following assumptions:
    
Stock Price
$
4.84

 
Exercise Price
$
3.64

 
Term in years
4.29

 
Volatility
101.93
%
 
Annual rate of quarterly dividends
0
%
 
Discount rate- bond equivalent yield
1.65
%
 

Equity Incentive Plan
The following is a summary of option award activity under the Plan for the year ended December 31, 2018:
    
 
Year Ended December 31, 2018
 
Total Stock Options
Outstanding
 
Weighted Average
Exercise Price per
Share
 
Nonvested Stock
Options
 
Weighted Average
Grant Date Fair
Value per Share
December 31, 2017
211,487

 
$
36.94

 
—

 
$
—

Forfeited, Canceled
(51,411
)
 
40.12

 
—

 
—

December 31, 2018
160,076

 
$
35.92

 
—

 
$
—


The following is a summary of outstanding stock options under the Plan as of December 31, 2018:
    
 
Stock Options
Outstanding
 
Vested Stock
Options
Quantity
160,076

 
160,076

Weighted-average exercise price
$
35.92

 
$
35.92

Weighted Average Remaining Contractual Term (in Years)
4.26

 
4.26

Intrinsic value
$
—

 
$
—


For the years ended December 31, 2018 and 2017, the Company granted no stock options. For the years ended December 31, 2018 and 2017, the total fair value of options vested was $0. The total intrinsic value of options exercised for the years ended December 31, 2018 and 2017 was $0.
As of December 31, 2018, there was no total compensation cost not yet recognized related to unvested stock options.