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Stockholders' Equity - Stock Options and a Summary of Activity (Details) - $ / shares
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Stockholders' Equity Note [Abstract]    
Fair value of options issued (in dollars per share) $ 5.18 $ 3.44
Exercise price (in dollars per share) $ 7.04 $ 4.48
Expected life of option (in years) 5 years 9 months 18 days 5 years 7 months 6 days
Risk-free interest rate 1.70% 1.80%
Expected volatility 90.70% 97.90%
Dividend yield 0.00% 0.00%
Number of Option    
Outstanding at beginning of period (in options) 459,271  
Granted (in options) 326,000  
Exercised (in options) (45,361)  
Canceled/forfeited (in options) (105,565)  
Expired (in options) (5,900)  
Outstanding at end of period (in options) 628,445  
Vested and expected to vest at period end (in options) 575,974  
Exercisable at period end (in options) 282,583  
Weighted Average Exercise Price Per Share    
Outstanding at beginning of period (in dollars per share) $ 8.95  
Granted (in dollars per share) 8.35  
Exercised (in dollars per share) 4.63  
Canceled/forfeited (in dollars per share) 6.26  
Expired (in dollars per share) 96.00  
Outstanding at end of period (in dollars per share) 8.58  
Vested and expected to vest at period end (in dollars per share) 8.71  
Exercisable at period end (in dollars per share) $ 9.18  
Weighted Average Remaining Contractual Life (in years)    
Outstanding at end of period 8 years 4 months 24 days  
Vested and expected to vest at period end 8 years 3 months 18 days  
Exercisable at period end 7 years 2 months 12 days