Net Income (Loss) Per Common Share Data (Calculation of Basic and Diluted Net (Loss) Income Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]      
Net income (loss) attributable to common stockholders $ (1,367) $ 3,815 $ 9,932
Less: Undistributed earnings allocated to preferred stockholders 0 0 (8,583)
Net income (loss) attributable to common stockholders (1,367) 3,815 1,349
Weighted average shares used to compute net income (loss) per share attributable to common stockholders 27,306,882 24,411,194 2,303,443
Basic net income (loss) per share $ (0.05) $ 0.16 $ 0.59
Diluted net income (loss0 per share:      
Net income (loss) attributable to common stockholders (1,367) 3,815 1,349
Add: Undistributed earnings allocated to preferred stockholders 0 0 8,583
Net income (loss) attributable to common stockholders $ (1,367) $ 3,815 $ 9,932
Weighted average shares used to compute net income (loss) per share attributable to common stockholders 27,306,882 24,411,194 2,303,443
Add weighted-average effect of dilutive securities:      
Conversion of preferred stock (as if converted basis) 0 1,948,635 17,395,136
Stock options and RSUs 0 [1] 1,737,484 [1] 2,275,824 [1]
Number of shares used in diluted calculation 27,306,882 [1] 28,097,313 [1] 21,974,403 [1]
Diluted net (loss) income per share attributable to common stockholders $ (0.05) $ 0.14 $ 0.45
[1] Stock options and RSUs are not included in the calculation of diluted net loss per share for the year ended December 31, 2013 because the Company had a net loss for that year. Accordingly, the inclusion of these equity awards would have had an antidilutive effect on the calculation of diluted loss per share.