INTELLECTUAL PROPERTY LICENSE (Details) - Boston Childrens Hospital Bch License - USD ($) $ in Thousands		12 Months Ended
Dec. 31, 2011	Dec. 31, 2017	Dec. 31, 2016
Intellectual Property License
Useful life	15 years
Initial license fee paid	$ 75
Capitalized license fees, gross		$ 200	$ 200
Milestone payments expensed		$ 175

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant