Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

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Stockholders' Equity (Details Textual) (USD $)
1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 15, 2010
Jun. 30, 2012
Jun. 30, 2011
May 31, 2012
Two thousand Two Stock Incentive Plan [Member]
Jun. 30, 2012
Restricted Stock Activity [Member]
Jun. 30, 2012
Employee Stock Purchase Plan [Member]
Jun. 30, 2011
Employee Stock Purchase Plan [Member]
Jun. 30, 2012
April 2013 [Member]
Class of Warrant or Right [Line Items]                
Increase the number of shares under the 2002 Stock Incentive Plan       1,800,000        
Stock-based compensation expense   $ 2,103,000 $ 1,696,000     $ 22,000 $ 700  
Weighted-average period in which cost is expected to be recognized   3 years 1 month 6 days     2 years      
Shares allowed to purchase in employee stock purchase plan           1,250    
Offering period of shares in employee stock purchase plan           6 months    
Description of purchase price of stock           equal to 85% of the lesser of fair market value on either the start date of the period or the last trading day of the period (the “Lookback Provision”).    
Percentage lesser of fair market value taken as purchase price of share           85.00%    
Discount rate           15.00%    
Common stock issued under amended ESSP           7,374 2,404  
Proceeds Received under amended ESPP           75,000 18,000  
Shares available for future purchases           89,917    
Warrants outstanding               163,568
Exercise price of warrants               179.40
Warrants to purchase number of shares   129,360           129,360
Entitled value when warrants exercised               100,000
Entitled value when warrants exercised, shares               981,411
Stockholders' Equity (Textual) [Abstract]                
Weighted-average grant date fair value of stock options   $ 8.90            
Weighted-average grant-date fair value of restricted stock   $ 13.75            
Intrinsic value of options exercised   300,000 2,500          
Shares available for future option grants   1,900,000            
Warrants to purchase number of shares   129,360           129,360
Unrecognized compensation cost   6,600,000            
Unrecognized compensation cost, restricted stock   1,400,000            
Repurchase of common shares, value 10,000,000              
Period for repurchase of shares   2 years            
Shares repurchased   16,905            
Value of repurchased shares   $ 100,000