Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net loss	$ (452)	$ (3,339)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	57	34
Reduction of provision for doubtful accounts		(204)
Deferred tax benefit		(150)
Stock-based compensation	749	856
Change in the fair value of warrant liability		3,057
Changes in operating assets and liabilities:
Accounts receivable	932	656
Inventories, net	(40)	(244)
Prepaid expenses and other current assets	(247)	73
Accounts payable, accrued expenses and other current liabilities	(669)	58
Net cash provided by operating activities	330	797
Cash flows from investing activities:
Purchase of equipment	(598)	(284)
Purchase of investments	(1,500)	(650)
Net cash used in investing activities	(2,098)	(934)
Cash flows from financing activities:
Proceeds from exercise of stock options and warrants	29	104
Net cash provided by financing activities	29	104
Net decrease in cash and cash equivalents	(1,739)	(33)
Cash and cash equivalents, beginning of period	7,571	7,796
Cash and cash equivalents, end of period	5,832	7,763
Cash paid for interest, net of amount capitalized of $4 thousand in 2012		15
Cash paid for taxes
Non-cash financing transactions:
Issuance of 310,897 shares of common stock for cashless exercise of 380,511 warrants in 2011