Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Cash Flows [Abstract]
Net loss	$ (14,950)	$ (22,024)	$ (13,251)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,527	4,755	4,032
Business Combination, Contingent Consideration Arrangement, Adjustment	0	0	(144)
Provision for bad debt expense	25	203	0
Stock-based compensation expense	3,723	5,385	3,003
Issuance of warrant to customer	0	1,007	0
Long-lived assets impairment charge	1,647	2,928	0
Impairment losses	0	4,140	0
Loss on write-off of fixed assets	244	0	0
Changes in operating assets and liabilities, net of effects of business acquisition:
Accounts receivable	6,621	3,309	(816)
Inventories	213	2,091	(2,938)
Prepaid expenses and other assets	1,740	(4,263)	1,702
Accounts payable	(7,474)	(92)	1,543
Accrued compensation and other expenses	(1,542)	6,169	(1,394)
Deferred revenue	2,017	(501)	147
Restructuring accrual	(963)	(336)	(33)
Other long-term liabilities	2,726	(571)	(946)
Net cash provided by (used in) operating activities	(2,446)	2,200	(9,095)
Cash Flows From Investing Activities:
Purchases of property and equipment	(6,152)	(2,548)	(1,490)
Acquisition, net of cash acquired	0	0	(625)
Proceeds from sale of property and equipment	74	0	0
Net cash (used in) investing activities	(6,078)	(2,548)	(2,115)
Cash Flows From Financing Activities:
Principal payment of note payable	(71)	(398)	(1,036)
Payments on bank borrowings	(1,800)	0	(5,800)
Proceeds from bank borrowings	4,600	0	5,800
Shares withheld for tax purposes	(590)	(422)	(477)
Proceeds from sale of stock to employees	756	1,450	765
Net cash provided by (used in) financing activities	2,895	630	(748)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(224)	154	116
Net Increase (Decrease) in Cash and Cash Equivalents	(5,853)	436	(11,842)
Cash and Cash Equivalents, beginning of period	46,168	45,732	57,574
Cash and Cash Equivalents, end of period	40,315	46,168	45,732
Supplemental Disclosures of Non-Cash Investing and Financing Activities:
Property and equipment acquired but not yet paid	477	1,540	67
Common stock issued in connection with acquisition	0	0	8,132
Stock payment for employee bonus plan	1,005	0	0
Supplemental Cash Flow Data:
Cash paid for income taxes	$ 116	$ 235	$ 90