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Stock Option and Equity Incentive Plans (Details 2) (Options, USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Options
  
Shares Under Options  
Outstanding at the beginning of the period (in shares) 493,888
Granted (in shares) 97,362
Exercised (in shares) (123,750)
Outstanding at the end of the period (in shares) 467,500
Options exercisable at the end of the period (in shares) 368,751
Vested and expected to vest at the end of the period (in shares) 467,500
Weighted Average Exercise Price  
Outstanding at the beginning of the period (in dollars per share) $ 5.47
Granted (in dollars per share) $ 19.74
Exercised (in dollars per share) $ 3.36
Outstanding at the end of the period (in dollars per share) $ 9.00
Options exercisable at the end of the period (in dollars per share) $ 6.51
Vested and expected to vest at the end of the period (in dollars per share) $ 9.00
Weighted Average Remaining Contractual Life  
Outstanding at the end of the period 3 years 7 months 24 days
Exercisable at the end of the period 3 years 6 months 29 days
Vested and expected to vest at the end of the period 3 years 7 months 24 days
Aggregate Intrinsic Value  
Outstanding at the end of the period $ 7,584
Options exercisable at the end of the period 6,900
Vested and expected to vest at the end of the period $ 7,584