Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income (loss)	$ 917	$ (15,543)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by (used in) operating activities:
Loss on extinguishment of debt	2,134	1,693
Change in fair value of derivative liability	49	(677)
Unrealized gain on marketable securities	89	1
Depreciation and amortization	214	227
Amortization of deferred financing costs and debt discount	374	574
Share-based compensation expense	901	667
Changes in operating assets and liabilities:
Accounts receivable	(2,001)	(4,671)
Inventories	(261)	(805)
Prepaid expenses and other assets	38	(660)
Accounts payable	(1,004)	(975)
Accrued expenses	366	(2,681)
Deferred product revenue, net		4,389
Deferred licensing revenue	(36)	(67)
Other non-current liabilities	(1,277)	(576)
Net cash provided by (used in) operating activities	503	(19,104)
Cash flows from investing activities
Purchases of marketable securities	(17,315)	(9,406)
Sales and maturities of marketable securities	8,731	9,096
Purchases of property and equipment, net	(189)	(263)
Deferred legal fees	(2,463)	(1,056)
Net cash used in investing activities	(11,236)	(1,629)
Cash flows from financing activities
Proceeds from issuance of common stock	147	6
Cash settlement of debt to equity conversion		(1)
Net cash provided by financing activities	147	5
Net change in cash and cash equivalents	(10,586)	(20,728)
Cash and cash equivalents at beginning of period	36,396	32,980
Cash and cash equivalents at end of period	25,810	12,252
Noncash financial activity:
Conversion of convertible notes and interest make-whole	$ 21,176	$ 10,418