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COMMITMENTS AND CONTINGENCIES, LEASES (Details) - Cambridge Lease
Sep. 17, 2012
USD ($)
ft²
item
Jun. 30, 2017
USD ($)
Commitments    
Lease space (in square feet) | ft² 26,150  
Term of commercial lease 6 years 3 months  
Number of options to extend lease | item 1  
Term of lease extension option 5 years  
Standby letter of credit $ 311,000  
Deferred rent liability   $ 208,000