RESERVES RELATED TO SALES ALLOWANCES (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 3,268	$ 2,531
Current provisions relating to sales in current year	5,864	7,573
Adjustments relating to prior years	(180)	(148)
Payments relating to sales in current year	(3,958)	(5,339)
Payments/returns relating to sales in prior years	(1,308)	(1,349)
Ending balance	3,686	3,268
Prompt pay and other discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	546	484
Current provisions relating to sales in current year	2,741	3,593
Adjustments relating to prior years	0	6
Payments relating to sales in current year	(2,357)	(3,154)
Payments/returns relating to sales in prior years	(440)	(383)
Ending balance	490	546
Patient financial assistance
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	143	90
Current provisions relating to sales in current year	315	443
Adjustments relating to prior years	3	11
Payments relating to sales in current year	(373)	(385)
Payments/returns relating to sales in prior years	(21)	(16)
Ending balance	67	143
Government rebates and chargebacks
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	1,987	1,634
Current provisions relating to sales in current year	2,760	3,270
Adjustments relating to prior years	(46)	(209)
Payments relating to sales in current year	(1,228)	(1,800)
Payments/returns relating to sales in prior years	(730)	(908)
Ending balance	2,743	1,987
Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	592	323
Current provisions relating to sales in current year	48	267
Adjustments relating to prior years	(137)	44
Payments relating to sales in current year	0	0
Payments/returns relating to sales in prior years	(117)	(42)
Ending balance	$ 386	$ 592