COMPONENTS OF ACCOUNT PAYABLE AND ACCRUED EXPENSES (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,409	$ 999
Accrued employee compensation and related taxes.	6,485	5,759
Total	24,799	17,373
Research and Development Operations
Accounts Payable and Accrued Liabilities [Line Items]
Accrued liabilities	7,919	3,020
Accrued License Fee
Accounts Payable and Accrued Liabilities [Line Items]
Accrued liabilities	3,317	3,165
Sales Allowances
Accounts Payable and Accrued Liabilities [Line Items]
Accrued liabilities	2,869	2,368
Other Accrued Liabilities
Accounts Payable and Accrued Liabilities [Line Items]
Accrued liabilities	$ 2,800	$ 2,062