Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (1,701)	$ (12,205)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	49	96
Foreign exchange (gain) loss	57	(38)
Stock-based compensation expense	394	753
Excess inventory expense		361
Warrant amendment expense	936
Amortization and write-off of deferred financing costs and discount on loans	408	762
Changes in operating assets and liabilities:
Increase in accounts receivable	(226)
Decrease (increase) in inventory	354	(1)
Decrease (increase) in prepaid expenses and other current assets	157	(39)
Decrease in accounts payable	(252)	(192)
Increase in accrued research contract costs	656	768
Increase in other accrued liabilities	213	522
Recognition of deferred revenue	(5,066)	(668)
Decrease in other liabilities	(168)	(204)
Net cash used in operating activities	(4,189)	(10,085)
Cash flows from investing activities:
Establishment of restricted cash in connection with senior secured term loan		(118)
Release of restricted cash in connection with conversion of 7.5556% convertible subordinated notes		118
Proceeds from sale of property and equipment		5
Purchases of property and equipment		(12)
Net cash (used in) provided by investing activities	(1,107)	111
Cash flows from financing activities:
Proceeds from exercise of warrants	1,541
Proceeds from issuance of preferred stock and warrants, net of issuance costs	2,833
Proceeds from issuance of common stock and warrants, net of issuance costs		10,872
Proceeds from loans and warrants		8,600
Deferred financing costs		(273)
Repayment of loans	(4,314)	(1,043)
Net cash provided by financing activities	60	18,156
Effect of exchange rate changes on cash and cash equivalents	(11)	(1)
Net (decrease) increase in cash and cash equivalents	(5,247)	8,181
Cash and cash equivalents at beginning of year	6,378	2,435
Cash and cash equivalents at end of period	1,131	10,616
Supplemental disclosure of cash flow information:
Cash paid for interest	614	394
Cash paid for income taxes	2	4
Conversion of preferred stock to common stock	1
Beneficial conversion feature in connection with issuance of preferred stock	3,550
Unpaid costs associated with issuance of preferred stock and warrants	74
Unpaid financing costs	301	310
Senior Secured Term Loan [Member]
Cash flows from investing activities:
Establishment of restricted cash in connection with senior secured term loan	(1,107)
Release of restricted cash in connection with conversion of 7.5556% convertible subordinated notes	$ 1,107