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LINE OF CREDIT - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Jun. 30, 2016
Dec. 31, 2017
Line of Credit Facility [Line Items]        
Outstanding amount $ 10,000,000 $ 10,000,000    
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Outstanding amount 10,000,000 10,000,000    
Revolving Credit Facility | Heritage Bank Of Commerce | Loan And Security Agreement        
Line of Credit Facility [Line Items]        
Maximum limit of amount under line of credit     $ 12,000,000  
Line of credit facility, basis of measurement     Federal Reserve's Prime  
Percentage of interest rate above prime rate     2.25%  
Write off of Deferred Debt Issuance Cost $ 55,000 $ 55,000    
Outstanding amount       $ 0