Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities
Net income	$ 3,934	$ 15,375	$ 28,747
Adjustments to reconcile net loss to net cash and cash equivalents provided by operating activities:
Stock-based compensation	6,067	3,856	3,423
Deferred taxes	(8,911)	(1,877)	(14,459)
Depreciation and amortization	22,343	6,900	3,878
Non-cash interest relating to convertible notes and loan cost amortization	7,281	6,831	559
Intangible asset impairment charge	6,685	0	0
Changes in operating assets and liabilities:
Accounts receivable, net	(23,963)	(4,635)	(4,784)
Inventories, net	(1,938)	(5,869)	(3,468)
Prepaid expenses and other current assets	(647)	(314)	(558)
Accounts payable	1,076	(1,027)	225
Accrued royalties	6,269	(96)	702
Accrued compensation and related expenses	443	(160)	575
Current income taxes, net	3,525	(5,380)	4,233
Accrued government rebates	1,260	2,367	2,011
Returned goods reserve	3,108	1,203	709
Accrued expenses and other	940	90	240
Net Cash and Cash Equivalents Provided by Operating Activities	27,472	17,264	22,033
Cash Flows From Investing Activities
Changes in restricted cash	(5,002)	0	0
Acquisition of product rights and other related assets	(144,494)	(30,500)	(34,634)
Acquisition of property and equipment	(4,566)	(2,183)	(1,120)
Net Cash and Cash Equivalents Used in Investing Activities	(154,062)	(32,683)	(35,754)
Cash Flows From Financing Activities
Net proceeds from equity offering	0	0	46,680
Net proceeds from convertible debt offering	0	0	138,243
Purchase of call option overlay, net	0	0	(15,623)
Payment of debt issuance costs	(294)	0	0
Proceeds from stock option exercises	1,570	819	819
Proceeds from warrant exercise	0	0	750
Excess tax benefit from share-based compensation awards	617	360	784
Repurchase of common stock under the stock repurchase program	(2,500)	0	0
Treasury stock purchases for restricted stock vestings and forfeitures	(122)	(113)	0
Net Cash and Cash Equivalents (Used in)/Provided by Financing Activities	(729)	1,066	171,653
Change in Cash and Cash Equivalents	(127,319)	(14,353)	157,932
Cash and cash equivalents, beginning of period	154,684	169,037	11,105
Cash and cash equivalents, end of period	27,365	154,684	169,037
Supplemental disclosure for cash flow information:
Cash paid for interest, net of amounts capitalized	4,078	4,149	0
Cash paid for income taxes, net	9,537	13,255	147
Supplemental non-cash investing and financing activities:
Accrued royalties related to asset purchase	3,882	0	0
Property and equipment purchased and included in accounts payable	$ 247	$ 439	$ 0