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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Levels of fair value measurements of financial assets:    
Restricted cash $ 1,000 $ 1,000
Recurring    
Levels of fair value measurements of financial assets:    
Restricted cash 1,000  
Recurring | Fair Value, Inputs, Level 1    
Levels of fair value measurements of financial assets:    
Restricted cash 1,000  
Recurring | Fair Value, Inputs, Level 2    
Levels of fair value measurements of financial assets:    
Restricted cash 0  
Recurring | Fair Value, Inputs, Level 3    
Levels of fair value measurements of financial assets:    
Restricted cash $ 0