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BASIS OF PRESENTATION - Contract Balances (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 02, 2018
Change in contract liability      
Beginning balance - Contract liability $ 8,433 $ 2,914  
Cash received in advance and not recognized as revenue 1,024 9,520  
Amounts recognized as revenue as performance obligations satisfied (6,828) (9,805)  
Ending balance - Contract liability 2,629 2,629  
Accrued expenses and other liabilities      
Contract liabilities      
Contract liability $ 2,629 $ 2,629 $ 2,914