PROPERTY AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property and Equipment
Property and equipment, gross	$ 14,743	$ 16,313
Less: Accumulated depreciation and amortization	(6,403)	(8,076)
Property and equipment, net	8,340	8,237
Property and equipment under capitalized leases	0	0
Depreciation and amortization expense	6,161	2,561	399
Furniture and office equipment
Property and Equipment
Property and equipment, gross	3,547	2,169
Laboratory equipment
Property and Equipment
Property and equipment, gross	5,151	4,623
Leasehold improvements
Property and Equipment
Property and equipment, gross	6,045	9,325
Construction in Progress
Property and Equipment
Property and equipment, gross		$ 196