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Stock Based Compensation, by Exercise Price Range (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Stock Options [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Number of Options (in shares) | shares 17,119,770  
Weighted-Average Remaining Contractual Life 7 years 9 months 11 days  
Weighted-Average Exercise Price (in dollars per share) $ 2.35  
Number of Options Exercisable (in shares) | shares 11,708,079  
Weighted-Average Remaining Contractual Life 7 years 1 month 17 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 2.85  
Aggregate intrinsic value of outstanding options | $ $ 40,825  
Aggregate intrinsic value of options vested | $ $ 11,340  
Closing price of the common stock (in dollars per share) $ 0.44  
Warrants [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Warrants outstanding (in shares) | shares 32,394,217 32,502,790
Weighted-average exercise price of warrants outstanding (in dollars per share) 0.68 0.68
Range $0.43 - $1.50 [Member] | Stock Options [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Range of Exercise Prices, Lower Range (in dollars per share) $ 0.43  
Range of Exercise Prices, Upper Range (in dollars per share) $ 1.50  
Number of Options (in shares) | shares 4,432,500  
Weighted-Average Remaining Contractual Life 9 years 8 months 12 days  
Weighted-Average Exercise Price (in dollars per share) $ 0.44  
Number of Options Exercisable (in shares) | shares 1,330,704  
Weighted-Average Remaining Contractual Life 9 years 8 months 16 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 0.44  
Range $1.51 - 2.50 [Member] | Stock Options [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Range of Exercise Prices, Lower Range (in dollars per share) 1.51  
Range of Exercise Prices, Upper Range (in dollars per share) $ 2.50  
Number of Options (in shares) | shares 8,752,604  
Weighted-Average Remaining Contractual Life 7 years 6 months 29 days  
Weighted-Average Exercise Price (in dollars per share) $ 2.26  
Number of Options Exercisable (in shares) | shares 6,469,375  
Weighted-Average Remaining Contractual Life 7 years 3 months 4 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 2.22  
Range $2.51 - 4.00 [Member] | Stock Options [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Range of Exercise Prices, Lower Range (in dollars per share) 2.51  
Range of Exercise Prices, Upper Range (in dollars per share) $ 4.00  
Number of Options (in shares) | shares 960,670  
Weighted-Average Remaining Contractual Life 6 years 10 months 17 days  
Weighted-Average Exercise Price (in dollars per share) $ 2.88  
Number of Options Exercisable (in shares) | shares 934,004  
Weighted-Average Remaining Contractual Life 6 years 10 months 10 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 2.87  
Range $4.01 - 32.55 [Member] | Stock Options [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Range of Exercise Prices, Lower Range (in dollars per share) 4.01  
Range of Exercise Prices, Upper Range (in dollars per share) $ 32.55  
Number of Options (in shares) | shares 2,973,996  
Weighted-Average Remaining Contractual Life 5 years 9 months 11 days  
Weighted-Average Exercise Price (in dollars per share) $ 5.32  
Number of Options Exercisable (in shares) | shares 2,973,996  
Weighted-Average Remaining Contractual Life 5 years 9 months 11 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 5.32