BUSINESS COMBINATIONS AND ACQUISITIONS - Pro forma (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Combinations and Acquisitions
Total revenues, net	$ 27,618	$ 12,578	$ 53,587	$ 20,635
Net loss	$ (27,520)	$ (17,475)	$ (54,997)	$ (51,263)	$ (103,000)
Diluted net loss per common share (in dollars per share)	$ (0.42)	$ (0.27)	$ (0.83)	$ (0.96)
Pro forma information
Interest expense	$ 6,727	$ 593	$ 13,380	$ 900
Tribute, Zontivity and Toprol XL and AG, Acquired entities
Pro forma information
Total revenues, net		45,500		78,343
Net loss		$ (10,758)		$ (27,294)
Diluted net loss per share (in dollars per share)		$ (0.17)		$ (0.47)
Tribute, Zontivity and Toprol XL and AG, Acquired entities | Pro Forma Adjustment
Pro forma information
Expense for excise tax equalization payments		$ 0		$ (12,000)
Severance charges		(400)		(4,000)
Inventory fair value step-up		(800)		(1,500)
Share-based compensation expense		0		(500)
Transaction costs		(300)		(12,700)
Amortization expense		(600)		(1,400)
Amortization of finite-lived intangible assets acquired		6,500		13,700
Zontivity and Toprol XL, Acquired entities | Pro Forma Adjustment
Pro forma information
Interest expense		6,200		12,400
Tribute, Acquired entity | Pro Forma Adjustment
Pro forma information
Interest expense		$ 0		$ (300)