Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (10,499)	$ 6,039
Adjustments to reconcile net income (loss) to net cash used for operating activities:
Depreciation and amortization	3,625	4,009
Deferred taxes	995	16
Stock-based compensation expense	2,010	2,124
Provision for excess inventory	406	536
Changes in operating assets and liabilities:
Accounts receivable	16	571
Inventories	(7,213)	(13,894)
Prepaid expenses and other current assets	(808)	4,442
Accounts payable and other current liabilities	(3,928)	(3,618)
Deferred revenue	(3,109)	(2,989)
Income taxes	(286)	629
Other assets and liabilities	6,226	(5,920)
Net cash used for operating activities	(12,565)	(8,055)
Cash flows from investing activities:
Expenditures for property, plant, and equipment	(385)	(1,231)
(Increase) decrease in restricted cash	3	(9)
Net cash used for investing activities	(382)	(1,240)
Cash flows from financing activities:
Financing fees and other expenses		(194)
Proceeds from exercise of stock options	847	239
Proceeds from Employee Stock Purchase Plan	179	275
Net cash provided by financing activities	1,026	320
Effect of exchange rate changes on cash	(1,159)	1,089
Net decrease in cash and cash equivalents	(13,080)	(7,886)
Cash and cash equivalents at beginning of period	46,877	45,743
Cash and cash equivalents at end of period	$ 33,797	$ 37,857