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Stock Based Compensation, by Exercise Price Range (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / 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 2,772,755  
Weighted-Average Remaining Contractual Life 7 years 6 months 25 days  
Weighted-Average Exercise Price (in dollars per share) $ 10.86  
Number of Options Exercisable (in shares) | shares 2,151,186  
Weighted-Average Remaining Contractual Life 7 years 1 month 10 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 12.96  
Aggregate intrinsic value of outstanding options | $ $ 0  
Aggregate intrinsic value of options vested | $ $ 0  
Warrants [Member]    
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]    
Warrants outstanding (in shares) | shares 3,980,781 3,980,781
Weighted-average exercise price of warrants outstanding (in dollars per share) 4.26 4.26
Range $1.75 - $5.00 [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) $ 1.75  
Range of Exercise Prices, Upper Range (in dollars per share) $ 5.00  
Number of Options (in shares) | shares 1,287,920  
Weighted-Average Remaining Contractual Life 9 years 3 months 29 days  
Weighted-Average Exercise Price (in dollars per share) $ 2.14  
Number of Options Exercisable (in shares) | shares 742,990  
Weighted-Average Remaining Contractual Life 9 years 3 months 22 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 2.19  
Range $5.01 - $11.00 [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) 5.01  
Range of Exercise Prices, Upper Range (in dollars per share) $ 11.00  
Number of Options (in shares) | shares 178,335  
Weighted-Average Remaining Contractual Life 4 years 8 months 12 days  
Weighted-Average Exercise Price (in dollars per share) $ 10.98  
Number of Options Exercisable (in shares) | shares 178,335  
Weighted-Average Remaining Contractual Life 4 years 8 months 12 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 10.98  
Range $11.01 - $15.00 [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) 11.01  
Range of Exercise Prices, Upper Range (in dollars per share) $ 15.00  
Number of Options (in shares) | shares 767,959  
Weighted-Average Remaining Contractual Life 6 years 11 months 8 days  
Weighted-Average Exercise Price (in dollars per share) $ 13.91  
Number of Options Exercisable (in shares) | shares 692,283  
Weighted-Average Remaining Contractual Life 6 years 10 months 10 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 13.83  
Range $15.01 - $98.28 [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) 15.01  
Range of Exercise Prices, Upper Range (in dollars per share) $ 98.28  
Number of Options (in shares) | shares 538,541  
Weighted-Average Remaining Contractual Life 5 years 2 months 8 days  
Weighted-Average Exercise Price (in dollars per share) $ 27.36  
Number of Options Exercisable (in shares) | shares 537,578  
Weighted-Average Remaining Contractual Life 5 years 2 months 8 days  
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 27.37