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	$ 823	$ (744)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Provision for doubtful accounts	556	166
Depreciation and amortization	3,377	3,284
Deferred income taxes	1,697	(166)
Loss on interest rate swaps	95	100
Compensation expense related to stock-based awards and employee stock purchase plan	2,747	2,677
Changes in operating assets and liabilities:
Accounts receivable	(3,197)	(635)
Inventories	778	(4,817)
Prepaid expenses and other assets	(257)	(253)
Other non-current assets	(442)	1,575
Accounts payable	467	(1,076)
Deferred revenue	(723)	662
Accrued expenses	3,493	(254)
Other long-term liabilities	(3)	(1,254)
Net cash provided by (used in) operating activities	9,411	(735)
Cash flows from investing activities:
Capital expenditures	(5,240)	(8,112)
Purchases of marketable securities	(13,106)	(39,789)
Maturities and sales of marketable securities	12,361	42,222
Net cash (used in) provided by investing activities	(5,985)	(5,679)
Cash flows from financing activities:
Repayments of long-term debt	(98)	(92)
Proceeds from stock options exercised and employee stock purchase plan	784	791
Repurchase of common stock	0	(2,037)
Payment of employee restricted stock withholdings	(333)	(625)
Repayments of line of credit borrowings	(2,000)	0
Repayments of Lines of Credit	0	6,500
Payment of stock registration fee	0	(10)
Net cash (used in) provided by financing activities	(1,647)	4,527
Effect of exchange rate changes on cash and cash equivalents	(175)	(91)
Net increase in cash and cash equivalents	1,604	(1,978)
Cash and cash equivalents at beginning of period	7,017	7,241
Cash and cash equivalents at end of period	$ 8,621	$ 5,263