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SUBSEQUENT EVENT (Notes)	9 Months Ended
SUBSEQUENT EVENT (Notes)	Sep. 30, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENT	SUBSEQUENT EVENT Lease Amendment On November 6, 2019, the Company amended its lease for its Woburn, Massachusetts headquarters pursuant to which the Company agreed to vacate 7,553 square feet of excess space, returning the space to the landlord in February 2020. Reductions in lease expense, including rent and tenant related expenses, are estimated to be approximately $0.4 million on an annualized basis.