CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net loss	$ (6,148)	$ (970)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	1,095	1,153
Amortization of debt discount and deferred financing fees	36	107
Provision for excess and obsolete inventories	160	560
Benefit from allowance for doubtful accounts	(129)	(45)
Restructuring charges	467	409
Stock-based compensation expense	1,333	1,013
Changes in operating assets and liabilities:
Accounts receivable	560	(928)
Inventories	516	914
Prepaid expenses and other assets	(370)	(552)
Accounts payable	141	(1,706)
Accrued expenses and other current liabilities	(1,526)	(687)
Restructuring liabilities	(480)	(1,169)
Net cash used by operating activities	(4,345)	(1,901)
Investing activities:
Capital expenditures	(343)	(54)
Investments in non-publicly traded companies	(26)	(10)
Proceeds from the sale of investments in non-publicly traded companies	0	2,700
Decrease in restricted cash	444	1,704
Purchases of short and long-term investments	(6,633)	(510)
Proceeds from sales and maturities of short-term investments	973
Net cash (used) provided by investing activities	(5,585)	3,830
Financing activities:
Issuance of common stock under employee stock plans	236	19
Payments for deferred financing costs	0	(167)
Proceeds from issuance of common stock, net of fees	16,075	6,327
Principal payments on 5.45% Convertible Notes due 2011	(2,502)	(2,502)
Net cash provided by financing activities	13,809	3,677
Effect of exchange rate changes on cash and cash equivalents	(50)	(763)
Change in cash and cash equivalents	3,829	4,843
Cash and cash equivalents at beginning of period	6,280	2,343
Cash and cash equivalents at end of period	$ 10,109	$ 7,186