Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 7,145	$ 15,516
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on extinguishment of debt	2,400	2,592
Change in fair value of derivative liability	(66)	(2,115)
Unrealized (gain) loss on marketable securities	47	(35)
Depreciation and amortization	651	701
Amortization of deferred financing costs and debt discount	646	1,599
Share-based compensation expense	3,152	2,023
Changes in operating assets and liabilities:
Accounts receivable	(6,334)	(10,249)
Inventories	(1,301)	(3,993)
Prepaid expenses and other assets	(2,793)	(1,256)
Accounts payable	949	1,569
Accounts sales deductions	10,359	(4,354)
Accrued expenses	(2,538)	6,454
Deferred product revenue, net		(7,882)
Deferred licensing revenue	(107)	(168)
Other non-current liabilities	(21)	337
Net cash provided by operating activities	12,189	739
Cash flows from investing activities
Purchases of marketable securities	(51,289)	(34,566)
Sales and maturities of marketable securities	33,671	41,987
Purchases of property and equipment	(1,240)	(475)
Deferred legal fees	(4,500)	(3,149)
Net cash (used in) provided by investing activities	(23,358)	3,797
Cash flows from financing activities
Proceeds from issuance of common stock	1,067	265
Cash settlement of debt to equity conversion		(1)
Net cash provided by financing activities	1,067	264
Net change in cash and cash equivalents	(10,102)	4,800
Cash and cash equivalents at beginning of period	36,396	32,980
Cash and cash equivalents at end of period	26,294	37,780
Supplemental cash flow information:
Cash paid for interest	504	1,502
Noncash financial activity:
Conversion of convertible notes and interest make-whole	26,019	$ 14,887
Exercise of warrants	652
Deferred legal fees included in accrued expenses	$ 6,866