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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator—basic:        
Net income $ 2,286 $ 1,960 $ 3,174 $ 2,690
Less deemed dividend on redeemable convertible preferred stock   (1,785) (987) (3,508)
Net income (loss) before preferred rights dividend 2,286 175 2,187 (818)
Less preferred rights dividend   (175)    
Less: undistributed earnings to preferred stock     (438)  
Net income (loss) attributable to common stockholders - basic 2,286   1,749 (818)
Net income (loss) before preferred rights dividend 2,286 175 2,187 (818)
Less undistributed earnings to preferred stock     (393)  
Net income (loss) attributable to common stockholders - diluted $ 2,286   $ 1,794 $ (818)
Denominator:        
Weighted-average common shares - basic common stock 18,201,661 274,487 13,843,803 274,396
Weighted-average common shares - diluted common stock 20,146,915 274,487 15,826,754 274,396
Net income (loss) per share - basic common stock $ 0.13   $ 0.13 $ (2.98)
Net income (loss) per share - diluted common stock $ 0.11   $ 0.11 $ (2.98)
Common Stock
        
Denominator:        
Net income (loss) per share - basic common stock $ 0.13   $ 0.13 $ (2.98)
Preferred Stock
        
Denominator:        
Net income (loss) per share - diluted common stock $ 0.11   $ 0.11 $ (2.98)