v2.4.0.6
Net income per share attributable to common stockholders: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income attributable to common stockholders, basic $ 1,461 $ 1,293 $ 3,118 $ 1,145
Net income attributable to common stockholders, diluted $ 1,461 $ 1,293 $ 3,118 $ 1,145
Denominator:        
Weighted average common shares, basic 34,799,000 23,258,000 34,384,000 14,927,000
Effect of dilutive stock options (in shares) 2,604,000 3,989,000 2,937,000 3,953,000
Effect of dilutive common stock warrants (in shares)   22,000   22,000
Weighted average common shares, dilutive 37,403,000 27,269,000 37,321,000 18,902,000
Net income per share attributable to common stockholders:        
Basic (in dollars per share) $ 0.04 $ 0.06 $ 0.09 $ 0.08
Diluted (in dollars per share) $ 0.04 $ 0.05 $ 0.08 $ 0.06
Anti-dilutive securities        
Anti-dilutive securities excluded from the computation of diluted net income per share 2,410 10,465 2,391 25,027
Convertible preferred stocks
        
Anti-dilutive securities        
Anti-dilutive securities excluded from the computation of diluted net income per share   8,284   22,846
Options to purchase common stock
        
Anti-dilutive securities        
Anti-dilutive securities excluded from the computation of diluted net income per share 2,410 2,164 2,391 2,164
Warrants to purchase preferred stock
        
Anti-dilutive securities        
Anti-dilutive securities excluded from the computation of diluted net income per share   17   17