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 income (loss)	$ (10,028)	$ 1,812
Adjustments to reconcile net income (loss) to net cash used for operating activities:
Depreciation and amortization	1,896	1,882
Deferred taxes	378	33
Stock-based compensation expense	1,082	1,222
Provision for excess inventory	248	246
Changes in operating assets & liabilities:
Accounts receivable	4,810	8,245
Inventories	(8,277)	(13,350)
Prepaid expenses and other current assets	(385)	4,404
Accounts payable & other current liabilities	(2,162)	3,168
Deferred revenue	(3,818)	(2,996)
Income taxes	76	3
Other assets and liabilities	6,483	(5,875)
Net cash used for operating activities	(9,697)	(1,206)
Cash flows from investing activities:
Expenditures for property, plant, and equipment	(141)	(610)
Increase in restricted cash	(3)	(6)
Net cash used for investing activities	(144)	(616)
Cash flows from financing activities:
Proceeds from exercise of stock options	802	197
Proceeds from Employee Stock Purchase Plan	175	239
Net cash provided by financing activities	977	436
Effect of exchange rate changes on cash	(795)	425
Net decrease in cash and cash equivalents	(9,659)	(961)
Cash and cash equivalents at beginning of period	46,877	45,743
Cash and cash equivalents at end of period	$ 37,218	$ 44,782