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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Software Development Costs (Details) - Software
12 Months Ended
Dec. 31, 2016
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life (in years) 3 years
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life (in years) 5 years