Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net income (loss)	$ 15,516	$ (69,867)
Adjustments to reconcile income (loss) to net cash provided by (used in) operating activities:
Loss on extinguishment of debt	2,592	1,162
Change in fair value of derivative liabilities	(2,115)	12,692
Unrealized gain (loss) on marketable securities	(35)	(24)
Depreciation and amortization	701	526
Amortization of deferred financing costs and debt discount	1,599	2,070
Stock-based compensation expense	2,023	1,260
Changes in operating assets and liabilities:
Accounts receivable	(10,249)	(7,208)
Interest receivable	(10)	(319)
Inventories	(3,993)	(4,036)
Prepaid expenses and other assets	(1,246)	(822)
Accounts payable and accrued expenses	3,669	4,339
Deferred product revenue, net	(7,882)	10,365
Deferred licensing revenue	(168)	869
Other non-current liabilities	337	465
Net cash provided by (used in) operating activities	739	(48,528)
Cash flows from investing activities
Purchases of marketable securities	(34,566)	(78,968)
Sales and maturities of marketable securities	41,987	47,666
Purchases of property and equipment, net	(475)	(1,414)
Capitalized patent defense costs	(3,149)	(306)
Net cash provided by (used in) investing activities	3,797	(33,022)
Cash flows from financing activities
Proceeds from issuance of common stock	265	2,164
Proceeds from convertible debt issuance		90,000
Cash settlement of debt to equity conversion	(1)
Repayment of secured notes payable		(24,344)
Financing costs and underwriters discounts		(3,627)
Net cash provided by financing activities	264	64,193
Net change in cash and cash equivalents	4,800	(17,357)
Cash and cash equivalents at beginning of period	32,980	40,302
Cash and cash equivalents at end of period	37,780	22,945
Supplemental cash flow information:
Cash paid for interest	1,502	975
Noncash financial activity:
Conversion of convertible notes	14,887
Initial value of interest make-whole derivative issued in connection with the convertible debt		9,270
Initial value of conversion option reported in equity		$ 22,336