Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Details)

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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reconciliation of the numerators and denominators used in computing basic and diluted net income per share        
Net income $ 1,306 $ 551 $ 2,965 $ 623
Basic number of weighted-average shares outstanding 33,686,112 32,296,636 32,912,084 32,102,386
Effect of dilutive shares:        
Options to purchase common stock (in shares) 2,057,245 889,373 1,812,114 897,644
Common warrants (in shares)   127,324 434,392 138,889
Unvested restricted stock (in shares) 128,618 45,373 101,454 40,125
Diluted number of weighted-average shares outstanding 35,871,975 33,358,706 35,260,044 33,179,044
Net income per share:        
Basic (in dollars per share) $ 0.04 $ 0.02 $ 0.09 $ 0.02
Diluted (in dollars per share) $ 0.04 $ 0.02 $ 0.08 $ 0.02