Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Computation of Earnings Per Share (Details)

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Summary of Significant Accounting Policies - Computation of Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator—basic:        
Net income $ 2,133 $ 774 $ 5,307 $ 3,464
Less deemed dividend on redeemable convertible preferred stock   (1,851) (987) (5,359)
Net income (loss) before preferred rights dividend 2,133 (1,077) 4,320 (1,895)
Less preferred rights dividend 0 0 0 0
Less: undistributed earnings to preferred stock     (563)  
Net income (loss) attributable to common stockholders - basic 2,133 (1,077) 3,757 (1,895)
Numerator—diluted:        
Net income 2,133 774 5,307 3,464
Less deemed dividend on redeemable convertible preferred stock   (1,851) (987) (5,359)
Net income (loss) before preferred rights dividend 2,133 (1,077) 4,320 (1,895)
Less undistributed earnings to preferred stock     (507)  
Net income (loss) attributable to common stockholders - diluted $ 2,133 $ (1,077) $ 3,813 $ (1,895)
Denominator:        
Weighted-average common shares - basic common stock 18,286,208 276,618 15,340,877 274,357
Weighted-average common shares - diluted common stock 20,213,102 276,618 17,293,833 274,357
Net income (loss) per share - basic common stock $ 0.12 $ (3.90) $ 0.24 $ (6.91)
Net income (loss) per share - diluted common stock $ 0.11 $ (3.90) $ 0.22 $ (6.91)
Common Stock
        
Denominator:        
Net income (loss) per share - basic common stock $ 0.12 $ (3.90) $ 0.24 $ (6.91)
Preferred Stock
        
Denominator:        
Net income (loss) per share - diluted common stock $ 0.11 $ (3.90) $ 0.22 $ (6.91)