CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details 4) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Sep. 09, 2014
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments	$ 600	$ 300	$ 1,700	$ 400
Estimated fair value of debt instruments
Reduction in basic and diluted net loss per share	$ (0.01)		$ (0.06)
Convertible notes due 2021
Estimated fair value of debt instruments
Interest rate (as a percent)	2.50%		2.50%			2.50%
Principal amount	$ 345,000		$ 345,000		$ 345,000	$ 345,000
Level 3
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Unfavorable contract assumed					3,343
Decrease in fair value of the unfavorable contract assumed	700		3,700
Level 3 | Interest Expense.
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Change in fair value			269
Level 3 | Selling general and administrative expense
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Change in fair value			(3,612)
Level 3 | Contingent consideration
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Balance at the beginning of the period			17,595
Balance at the end of the period	14,862		14,862
Level 3 | Contingent consideration | Interest Expense.
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			1,697
Level 3 | Contingent consideration | Selling general and administrative expense
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Change in fair value	700
Net accretion value adjustments			(3,727)
Level 3 | Contingent consideration | Royalties Paid
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			(703)
Level 3 | Contingent consideration | Zipsor
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Balance at the beginning of the period			1,800
Balance at the end of the period	1,448		1,448
Level 3 | Contingent consideration | Zipsor | Interest Expense.
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			166
Level 3 | Contingent consideration | Zipsor | Selling general and administrative expense
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			(518)
Level 3 | Contingent consideration | Lazanda
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Balance at the beginning of the period			11,209
Balance at the end of the period	11,977		11,977
Level 3 | Contingent consideration | Lazanda | Interest Expense.
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			1,107
Level 3 | Contingent consideration | Lazanda | Selling general and administrative expense
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			364
Level 3 | Contingent consideration | Lazanda | Royalties Paid
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			(703)
Level 3 | Contingent consideration | CAMBIA
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Balance at the beginning of the period			1,243
Balance at the end of the period	1,437		1,437
Level 3 | Contingent consideration | CAMBIA | Interest Expense.
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			155
Level 3 | Contingent consideration | CAMBIA | Selling general and administrative expense
Changes in fair value of all financial liabilities measured at fair value on a recurring basis
Net accretion value adjustments			39
Fair Value | Level 2 | Convertible notes due 2021
Estimated fair value of debt instruments
Estimated fair value of debt	$ 411,200		$ 411,200		$ 375,200