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SUMMARY OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details)
$ / shares in Units, shares in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Customer
shares
Jun. 30, 2016
Customer
Dec. 31, 2016
Customer
May 25, 2017
$ / shares
Summary Of Significant Accounting Policies [Line Items]        
Stock Issued During Period, Shares, New Issues | shares 5,060      
Share Price | $ / shares       $ 27.95
AggregateProceedsFollowOnPublicOfferingAndOverAllotmentOptionNetDiscountsAndCommissions $ 134,709,000      
Payments for Commissions 6,718,000      
OfferingCosts $ 432,000      
Accounts Receivable        
Summary Of Significant Accounting Policies [Line Items]        
Number of Customers | Customer 1   1  
Accounts Receivable | Customer Concentration Risk        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk (as a percent)     15.00%  
Revenue        
Summary Of Significant Accounting Policies [Line Items]        
Number of Customers | Customer 0 0    
Maximum | Accounts Receivable | Customer Concentration Risk        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk (as a percent) 15.00%      
Maximum | Revenue | Customer Concentration Risk        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk (as a percent) 10.00% 10.00%