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Stockholders' Equity - Stock Options and a Summary of Activity (Details) - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stockholders' Equity Note [Abstract]    
Fair value of options issued (in dollars per share) $ 5.59 $ 4.07
Exercise price (in dollars per share) $ 7.42 $ 5.47
Expected life of option (in years) 5 years 9 months 18 days 5 years 10 months 24 days
Risk-free interest rate 1.60% 1.70%
Expected volatility 93.30% 91.30%
Dividend yield 0.00% 0.00%
Number of Options    
Outstanding at beginning of period (in shares) 602,207  
Granted (in shares) 123,790  
Exercised (in shares) (3,761)  
Canceled/forfeited (in shares) (6,506)  
Expired (in shares) 0  
Outstanding at end of period (in shares) 715,730  
Vested and expected to vest at period end (in shares) 656,646  
Exercisable at period end (in shares) 382,787  
Weighted Average Exercise Price Per Share    
Outstanding at beginning of period (in dollars per share) $ 8.58  
Granted (in dollars per share) 7.42  
Exercised (in dollars per share) 3.77  
Canceled/forfeited (in dollars per share) 12.12  
Expired (in dollars per share) 0.00  
Outstanding at end of period (in dollars per share) 8.38  
Vested and expected to vest at period end (in dollars per share) 8.50  
Exercisable at period end (in dollars per share) $ 9.01  
Weighted Average Remaining Contractual Life (in years)    
Outstanding at end of period 8 years 2 months 12 days  
Vested and expected to vest at period end 8 years 1 month 6 days  
Exercisable at period end 7 years 3 months 18 days