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Stock Based Compensation, by Exercise Price Range (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / 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 14,021,292  
Weighted-Average Remaining Contractual Life 7 years 11 months 5 days  
Weighted-Average Exercise Price (in dollars per share) $ 3.04  
Number of Options Exercisable (in shares) | shares 9,286,827  
Weighted-Average Remaining Contractual Life 7 years 4 months 17 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 3.31  
The aggregate intrinsic value of outstanding options | $ $ 0.8  
Aggregate intrinsic value of options vested | $ $ 0.6  
Closing price of the common stock (in dollars per share) $ 2.23  
Warrants [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Warrants outstanding (in shares) | shares 8,359,618 7,225,472
Weighted-average exercise price of warrants outstanding (in dollars per share) 3.96 4.28
Range $1.83 - $2.00 [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) $ 1.83  
Range of Exercise Prices, Upper Range (in dollars per share) $ 2.00  
Number of Options (in shares) | shares 1,224,500  
Weighted-Average Remaining Contractual Life 6 years 5 months 12 days  
Weighted-Average Exercise Price (in dollars per share) $ 1.83  
Number of Options Exercisable (in shares) | shares 1,224,500  
Weighted-Average Remaining Contractual Life 6 years 5 months 12 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 1.83  
Range $2.01 - 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) 2.01  
Range of Exercise Prices, Upper Range (in dollars per share) $ 2.50  
Number of Options (in shares) | shares 8,395,558  
Weighted-Average Remaining Contractual Life 8 years 8 months 12 days  
Weighted-Average Exercise Price (in dollars per share) $ 2.32  
Number of Options Exercisable (in shares) | shares 4,071,021  
Weighted-Average Remaining Contractual Life 8 years 3 months  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 2.30  
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 1,047,693  
Weighted-Average Remaining Contractual Life 7 years 9 months  
Weighted-Average Exercise Price (in dollars per share) $ 2.86  
Number of Options Exercisable (in shares) | shares 910,194  
Weighted-Average Remaining Contractual Life 7 years 6 months 25 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 2.86  
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 3,353,541  
Weighted-Average Remaining Contractual Life 6 years 7 months 13 days  
Weighted-Average Exercise Price (in dollars per share) $ 5.34  
Number of Options Exercisable (in shares) | shares 3,081,112  
Weighted-Average Remaining Contractual Life 6 years 6 months 14 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 5.38