Accounts Receivable
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Accounts Receivable
5. ACCOUNTS RECEIVABLE:

Included in accounts receivable are unbilled amounts totaling approximately $2.7 million and $1.8 million at December 31, 2013 and 2012, respectively, which relate to services performed during the year and billed in the subsequent year. The Company maintains allowances for potential losses which management believes are adequate to absorb any probable losses to be incurred in realizing the accounts receivable amounts recorded in the accompanying consolidated financial statements.

The following are the changes in the allowance for doubtful accounts:

 

     Year Ended December 31,  
     2013     2012     2011  
     (In Thousands)  

Balance at beginning of year

    $ 250      $ 300      $ 595   

Provisions for doubtful accounts

      39        21        —     

Charge-offs, net of recoveries

      (139 )      (71 )      (295 ) 
  

 

 

    

 

 

    

 

 

  

Balance at end of year

    $ 150      $ 250      $ 300