DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 13,586
Ending balance	31,535	$ 13,586
Chargebacks [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	11,381	6,865	$ 4,076
Accruals/Adjustments	114,433	51,933	35,740
Credits Taken Against Reserve	(99,029)	(47,417)	(32,951)
Ending balance	26,785	11,381	6,865
Government Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	4,631	2,264	253
Accruals/Adjustments	9,671	6,719	2,692
Credits Taken Against Reserve	(8,411)	(4,352)	(681)
Ending balance	5,891	4,631	2,264
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	2,648	1,445	736
Accruals/Adjustments	10,271	2,808	1,493
Credits Taken Against Reserve	(7,163)	(1,605)	(784)
Ending balance	5,756	2,648	1,445
Administrative Fees And Other Rebates [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	1,653	1,487	735
Accruals/Adjustments	12,747	6,136	5,212
Credits Taken Against Reserve	(10,850)	(5,970)	(4,460)
Ending balance	3,550	1,653	1,487
Prompt Payment Discounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	674	471	332
Accruals/Adjustments	5,517	2,744	1,820
Credits Taken Against Reserve	(4,637)	(2,541)	(1,681)
Ending balance	$ 1,554	$ 674	$ 471