Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net income (loss)	$ 2,923	$ (12,342)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by (used in) operating activities:
Loss on extinguishment of debt	2,375	1,732
Change in fair value of derivative liability	48	(1,355)
Unrealized gain on marketable securities	3	1
Depreciation and amortization	431	460
Amortization of deferred financing costs and debt discount	524	1,087
Share-based compensation expense	2,020	1,319
Changes in operating assets and liabilities:
Accounts receivable	(630)	(5,800)
Inventories	(151)	(2,949)
Prepaid expenses and other assets	(738)	(1,019)
Accounts payable	2,655	(1,329)
Accrued expenses	6,266	2,059
Deferred product revenue, net		(7,882)
Deferred licensing revenue	(72)	(133)
Other non-current liabilities	(482)	107
Net cash provided by (used in) operating activities	15,172	(26,044)
Cash flows from investing activities
Purchases of marketable securities	(34,274)	(19,902)
Sales and maturities of marketable securities	21,862	27,093
Purchases of property and equipment, net	(777)	(381)
Deferred legal fees	(6,278)	(2,040)
Net cash (used in) provided by investing activities	(19,467)	4,770
Cash flows from financing activities
Proceeds from issuance of common stock	1,009	251
Cash settlement of debt to equity conversion		(1)
Net cash provided by financing activities	1,009	250
Net change in cash and cash equivalents	(3,286)	(21,024)
Cash and cash equivalents at beginning of period	36,396	32,980
Cash and cash equivalents at end of period	33,110	11,956
Supplemental cash flow information:
Cash paid for interest	504	1,502
Noncash financial activity:
Conversion of convertible notes and interest make-whole	$ 25,056	$ 10,676