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Stockholders' Equity (Stock Option Activity) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Weighted-Average Fair Value per Share        
Weighted-Average Fair Value per Share, Options granted (in dollars per share) $ 3.01 $ 3.76 $ 0.91  
Share-based compensation expense $ 2,741,000 $ 1,078,000 $ 498,000  
Stock Options [Member]        
Number of Options Outstanding        
Number of Options Outstanding at beginning of period (in shares) 665,210 357,991 187,622  
Number of Options Outstanding, options granted (in shares) 420,616 386,797 191,045  
Number of Options Outstanding, options exercised (in shares) (106,338) (435)    
Number of Options Outstanding, options forfeited (in shares) (201,100) (79,143) (20,676)  
Number of Options Outstanding at end of period (in shares) 778,388 665,210 357,991 187,622
Number of Options Outstanding, Options vested and expected to vest (in shares) 769,142 149,907 59,106  
Number of Options Outstanding, Options vested and exercisable (in shares) 244,631 149,907 56,675  
Weighted-Average Exercise Price        
Weighted-Average Exercise Price, beginning of period (in dollars per share) $ 4.39 $ 1.40 $ 1.04  
Weighted-Average Exercise Price, options granted (in dollars per share) 6.93 7.03 1.77  
Weighted-Average Exercise Price, options exercised (in dollars per share) 2.17 1.77    
Weighted-Average Exercise Price, options forfeited (in dollars per share) 5.62 3.87 1.28  
Weighted-Average Exercise Price, end of period (in dollars per share) 5.75 4.39 1.40 $ 1.04
Weighted-Average Exercise Price, Options vested and expected to vest (in dollars per share) 5.72 1.58 0.79  
Weighted-Average Exercise Price, Options vested and exercisable (in dollars per share) $ 3.78 $ 1.58 $ 0.79  
Weighted-Average Remaining Contractual Life 8 years 4 months 21 days 8 years 9 months 11 days 9 years 1 month 28 days 9 years 7 months 24 days
Weighted-Average Remaining Contractual Life, Options vested and expected to vest 8 years 4 months 13 days 7 years 9 months 22 days 8 years 15 days  
Weighted-Average Remaining Contractual Life, Options vested and exercisable 6 years 10 months 28 days 7 years 9 months 22 days 8 years 15 days  
Weighted-Average Fair Value per Share        
Weighted-Average Fair Value per Share, beginning (in dollars per share) $ 2.37 $ 0.79 $ 0.67  
Weighted-Average Fair Value per Share, Options granted (in dollars per share) 6.93 3.76 0.91  
Weighted-Average Fair Value per Share, Options exercised (in dollars per share) 2.24 0.93    
Weighted-Average Fair Value per Share, Options forfeited (in dollars per share) 4.99 2.09 0.79  
Weighted-Average Fair Value per Share, ending (in dollars per share) $ 5.75 $ 2.37 $ 0.79 $ 0.67
Aggregate intrinsic value of options vested $ 600,000 $ 1,200,000    
Aggregate intrinsic value of options outstanding 1,300,000 3,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 600,000 6,000    
Aggregate intrinsic value of option vested and expected to vest 1,300,000 1,200,000    
Total fair value of employee options vested during the period $ 804,000 $ 106,000    
Weighted-average grant date fair value of unvested shares (in dollars per share) $ 3.53 $ 2.79    
Unrecognized compensation costs $ 1,300,000      
Unrecognized compensation costs, period of recognition 2 years 1 month 17 days      
Proceeds from exercise of stock options $ 106,000      
Excess tax benefit recognized 45,000      
Tax benefit to be recognized $ 16,000