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SEGMENT INFORMATION, REVENUES BY GEOGRAPHY AND SIGNIFICANT CUSTOMERS - Percentage of Revenues, Accounts Receivable (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Revenues          
Revenue, Major Customer [Line Items]          
Concentration percentage 100.00% 100.00% 100.00% 100.00%  
Revenues | Customer A          
Revenue, Major Customer [Line Items]          
Concentration percentage 11.00% 13.00% 10.00% 11.00%  
Revenues | Customer B          
Revenue, Major Customer [Line Items]          
Concentration percentage 11.00%   11.00%    
Accounts Receivable | Customer A          
Revenue, Major Customer [Line Items]          
Concentration percentage     11.00%   12.00%
Accounts Receivable | Customer B          
Revenue, Major Customer [Line Items]          
Concentration percentage     16.00%   15.00%