Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (19,216)	$ 7,190
Adjustments to reconcile net income (loss) to net cash (used for) provided by operating activities:
Depreciation and amortization	5,419	6,180
Deferred taxes	998	75
Stock-based compensation expense	3,411	3,644
Provision for excess inventory	678	661
Changes in operating assets & liabilities
Accounts receivable	10,143	17,994
Inventories	(3,496)	(13,384)
Prepaid expenses and other current assets	4,490	5,910
Accounts payable & other current liabilities	(11,601)	(15,237)
Deferred revenue	(5,089)	(4,339)
Income taxes	(135)	798
Other assets and liabilities	3,025	(8,640)
Net cash (used for) provided by operating activities	(11,373)	852
Cash flows from investing activities:
Expenditures for property, plant, and equipment	(536)	(1,950)
Decrease in restricted cash	1
Net cash used for investing activities	(535)	(1,950)
Cash flows from financing activities:
Financing fees and other expenses		(199)
Proceeds from exercise of stock options	863	272
Proceeds from Employee Stock Purchase Plan	179	275
Net cash provided by financing activities	1,042	348
Effect of exchange rate changes on cash	(791)	(580)
Net decrease in cash and cash equivalents	(11,657)	(1,330)
Cash and cash equivalents at beginning of period	46,877	45,743
Cash and cash equivalents at end of period	$ 35,220	$ 44,413