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Correction (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Mar. 31, 2018
Dec. 30, 2017
Correction        
Non-current liabilities $ 32,931     $ 32,547
Deferred compensation and other non-current liabilities 8,771     11,526
Deferred rent and facility-related non-current liabilities 23,785     20,656
Allowance netted against accounts receivable 5,399     5,252
Accounts receivable, net of allowance 88,921     79,803
Allowance netted against unbilled service 1,273     865
Unbilled services, net of allowance 38,241     33,530
Accounts receivable allowance 842 $ 1,536    
Accounts receivable (9,868) (5,260)    
Net cash used in operating activities $ (32,801) (8,483)    
As previously reported        
Correction        
Deferred compensation and other non-current liabilities       20,656
Deferred rent and facility-related non-current liabilities       11,526
Allowance netted against accounts receivable       7,378
Accounts receivable, net of allowance       79,803
Allowance netted against unbilled service       1,746
Unbilled services, net of allowance       $ 33,530
Accounts receivable allowance   2,620    
Accounts receivable   (6,344)    
Net cash used in operating activities   $ (8,483)    
Net effect        
Correction        
Non-current liabilities     $ 0  
Total liabilities     $ 0