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Stock Option and Equity Incentive Plans (Details 2) (Options, USD $)
 12 Months Ended
Dec. 31, 2012
Options
  
Shares Under Options  
Outstanding at the beginning of the period (in shares) 638,521
Granted (in shares) 7,770
Exercised (in shares) (141,153)
Cancelled or expired (in shares) (11,250)
Outstanding at the end of the period (in shares) 493,888
Options exercisable at the end of the period (in shares) 461,388
Vested and expected to vest at the end of the period (in shares) 493,888
Weighted Average Exercise Price  
Outstanding at the beginning of the period (in dollars per share) $ 4.98
Granted (in dollars per share) $ 16.32
Exercised (in dollars per share) $ 3.58
Cancelled or expired (in dollars per share) $ 9.09
Outstanding at the end of the period (in dollars per share) $ 5.47
Options exercisable at the end of the period (in dollars per share) $ 5.10
Vested and expected to vest at the end of the period (in dollars per share) $ 5.47
Aggregate Intrinsic Value  
Outstanding at the end of the period (in dollars) $ 6,149,167
Options exercisable at the end of the period (in dollars) 5,913,492
Vested and expected to vest at the end of the period (in dollars) $ 6,149,167