COMMITMENTS AND CONTINGENCIES (Details) - Cambridge Lease $ in Thousands	Sep. 17, 2012 USD ($) ft² item	Sep. 30, 2016 USD ($)
Commitments
Lease Space for Laboratory and office space (in square feet) \| ft²	26,150
Number of lease extension options \| item	1
Term of lease extension option	5 years
Standby letter of credit	$ 311
Deferred rent liability		$ 309

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

Name:	us-gaap_DeferredRentCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant