Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Leases    
Loss on sublease   $ 9,302
Minimum    
Property and equipment    
Estimated useful life 3 years  
Maximum    
Property and equipment    
Estimated useful life 7 years