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Stockholders' Equity (Details Textual) (USD $)
 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Nov. 19, 2010
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Public Offering
Dec. 31, 2012
Public Offering
Dec. 31, 2012
At the Market Equity Offering Program
Dec. 31, 2013
2006 Stockholder Rights Plan
right
Dec. 31, 2013
Series A Preferred Stock
Dec. 31, 2013
Stock Options
Dec. 31, 2012
Stock Options
Dec. 31, 2011
Stock Options
Dec. 31, 2013
Restricted Stock
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2013
2002 Stock Incentive Plan
Director
May 31, 2012
2002 Stock Incentive Plan
Stock Options
May 29, 2009
2002 Stock Incentive Plan
Stock Options
Dec. 31, 2013
2002 Stock Incentive Plan
Stock Options
Dec. 31, 2013
2002 Stock Incentive Plan
Stock Options
Vest 1/8 on the six month anniversary of the date of grant
Dec. 31, 2013
2002 Stock Incentive Plan
Stock Options
Vest 1/48 each month for forty-two months
Dec. 31, 2013
Employee Stock Purchase Plan
Dec. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2013
Employee Stock Purchase Plan
Stock Options
Dec. 31, 2012
Employee Stock Purchase Plan
Stock Options
Dec. 31, 2011
Employee Stock Purchase Plan
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                      
Increase the number of shares under the 2002 Stock Incentive Plan                                 1,800,000 1,300,000                  
Shares available for future option grants                                     1,500,000                
Award vesting period                         3 years     1 year       6 months 42 months            
Award vesting right percentage                                       12.50% 2.08%            
Award expiration period                                     10 years     6 months          
Weighted-average grant date fair value of stock options                   $ 14.28 $ 9.13 $ 6.32                              
Intrinsic value of options exercised                   $ 5,900,000 $ 500,000 $ 10,000                              
Unrecognized compensation cost                   7,100,000                                  
Weighted-average period in which cost is expected to be recognized                   2 years 3 months 15 days     1 year 1 month 24 days                            
Cash received from options exercised                                                 3,000,000 1,000,000 58,000
Weighted-average grant-date fair value of restricted stock                         $ 27.71 $ 13.76 $ 10.07                        
Unrecognized compensation cost, restricted stock                         1,300,000                            
Employee Stock Purchase Plan [Abstract]                                                      
Shares allowed to purchase in employee stock purchase plan                                           1,250          
Offering period of shares in employee stock purchase plan                                           6 months          
Percentage lesser of fair market value taken as purchase price of share                                           85.00%          
Discount rate                                           15.00%          
Common stock issued under amended ESSP                                           5,016 10,763 7,611      
Stock-based compensation expense   5,666,000 4,067,000 3,351,000                                   44,517 38,000 13,000      
Revenue volatility                                           36.00% 34.00% 18.00%      
Shares issued under employee stock purchase plan                                           208,673          
Shares available for future purchases                                           79,515          
Preferred Stock [Abstract]                                                      
Preferred stock authorized   5,000,000             1,600,000                                    
Shareholder Rights Plan and Warrants [Abstract]                                                      
Number of rights per outstanding share of common stock               1                                      
Exercise price of warrants               100                                      
Percentage acquistion of company's common stock causing warrants or rights to become exercisable               20.00%                                      
Percentage acquistion of company's common stock from tender offer causing warrants or rights to become exercisable               20.00%                                      
Business combination, acquiring person discount               50.00%                                      
Warrants to purchase number of shares               0.001                                      
Warrants to purchase shares, stockholder other than acquiring person, exercise price percentage               200.00%                                      
Common Stock, Shares, Issued   20,468,521 21,278,606   0 302,750                                          
Reverse Stock Split [Abstract]                                                      
Reverse stock split, conversion ratio 0.1667                                                    
Public Offering [Abstract]                                                      
Stock issued, weighted average price per share           $ 18.87                                          
Proceeds from issuance of common stock, net   0 5,313,000 0     5,500,000                                        
Stock Repurchase Program, Authorized Amount   $ 5,000,000