Consolidated Statements of Cash Flow (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities
Net income (loss)	$ 5,077	$ (17,573)	$ (77,468)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities
Undistributed loss of SEN			3,238
Depreciation and amortization	8,497	7,045	7,436
Gain on sale of SEN			(1,080)
Deferred income taxes	585	(1,525)	(765)
Other	28		133
Stock-based compensation expense	4,687	4,088	4,651
Provision for excess inventory	1,015	2,015	9,818
Changes in operating assets & liabilities
Accounts receivable	22,692	(38,652)	8,572
Inventories	(11,870)	3,549	26,445
Prepaid expenses and other current assets	3,049	(3,469)	8,131
Accounts payable & other current liabilities	(17,940)	32,276	(11,038)
Deferred revenue	(4,006)	10,601	(8,695)
Income taxes	507	(1,406)	1,154
Other assets and liabilities	(8,788)	(2,841)	(4,474)
Net cash provided by (used for) operating activities	3,533	(5,892)	(33,942)
Cash flows from investing activities
Expenditures for property, plant, and equipment	(2,124)	(1,403)	(463)
Decrease in restricted cash	3	7,056	1,491
Proceeds from sale of SEN			132,847
Payments related to sale of SEN			(10,590)
Net cash (used for) provided by investing activities	(2,121)	5,653	123,285
Cash flows from financing activities
Repayment of convertible debt			(83,344)
Financing fees and other expenses	(200)	(523)
Proceeds from exercise of stock options	288	553	45
Proceeds from Employee Stock Purchase Plan	503	569	184
Net cash provided by (used for) financing activities	591	599	(83,115)
Effect of exchange rate changes on cash	(869)	363	1,098
Net increase in cash and cash equivalents	1,134	723	7,326
Cash and cash equivalents at beginning of period	45,743	45,020	37,694
Cash and cash equivalents at end of period	46,877	45,743	45,020
Cash paid for interest			3,009
Cash paid for income taxes	515	2,286	734
Non cash investing and financing activities:
Issuance of restricted common stock in satisfaction of accrued compensation		$ 570