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5. Accrued business consolidation and restructuring expenses (Detail) - Restructuring Accrual Activity (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Accrual balance, beginning of period	$ 45
Severance and moving charges	117
Cash payments	(61)
Accrual balance, end of period	$ 101

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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