Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net loss	$ (4,225)	$ (369)	$ (42,567)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,864	11,922	15,354
Inventory valuation allowance	2,668	1,368	2,995
Deferred income taxes	(842)	403	(513)
Canadian deferred tax foreign exchange benefit	0	0	(3,204)
Deferred tax valuation allowance reversal	(7,654)	0	42,003
Tax liability adjustments	0	(1,029)	0
Non-cash interest expense	420	448	448
Gain on the liquidation of a foreign subsidiary	(2,081)	0	0
Loss (gain) on disposal of property and equipment	143	(462)	39
Loss on ARS settlement right	0	7,833	3,238
Gain on ARS	0	(7,854)	(3,658)
Stock-based compensation expense	5,717	6,158	8,520
Gain on early extinguishment of convertible notes	(44)	0	0
Other	1,731	641	449
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	7,146	2,102	937
Other receivables	(1,202)	2,043	(2,618)
Inventories	(9,221)	(1,030)	12,130
Inventory deposit	(2,249)	(4,068)	(2,370)
Other current assets	451	(934)	432
Accounts payable	2,629	82	(5,050)
Accrued wages and bonuses	1,317	(536)	(4,319)
Accrued restructuring	2,148	(971)	2,932
Deferred income	4,269	998	881
Other accrued liabilities	(3,177)	(656)	(619)
Net cash provided by operating activities	14,808	16,089	25,440
Cash flows from investing activities:
Acquisitions, net of cash acquired	(79,298)	(3,385)	0
Proceeds from sale of auction rate securities	0	62,175	550
Capital expenditures	(8,171)	(4,061)	(4,805)
Purchase of long-term assets	(500)	(3,758)	(592)
Proceeds from the sale of property and equipment	0	477	0
Net cash provided by (used in) investing activities	(87,969)	51,448	(4,847)
Cash flows from financing activities:
Borrowings on line of credit	0	13,738	1,752
Payments on line of credit	0	(55,025)	0
Repurchase of convertible notes	(4,875)	0	0
Repurchases of common stock	(3,920)	0	0
Proceeds from issuance of common stock	1,646	2,586	4,754
Other financing activities	(923)	(469)	(499)
Net cash provided by (used in) financing activities	(8,072)	(39,170)	6,007
Effect of exchange rate changes on cash	(75)	39	92
Net increase (decrease) in cash and cash equivalents	(81,308)	28,406	26,692
Cash and Cash Equivalents, beginning of period	129,078	100,672	73,980
Cash and Cash Equivalents, end of period	47,770	129,078	100,672
Supplemental disclosure of cash flow information:
Interest	1,424	1,375	1,375
Income taxes	806	592	194
Supplemental disclosure of non-cash financing activities:
Issuance of common stock for acquisitions	30,818	0	0
Capital lease obligation	134	0
Common stock issued pursuant to benefit plans	$ 314	$ 0	$ 0