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Revenue Recognition	3 Months Ended
Mar. 31, 2012
Revenue Recognition [Abstract]
Revenue Recognition	2. Revenue Recognition We recognize revenue from product sales when there is persuasive evidence that an arrangement exists, delivery has occurred and title has transferred, the price is fixed or determinable, and collection is reasonably assured, which is generally upon shipment. We accrue for estimated sales returns and other allowances, based on historical experience, at the time we recognize revenue.

Revenue Recognition

3 Months Ended

Mar. 31, 2012

2. Revenue Recognition

We recognize revenue from product sales when there is persuasive evidence that an arrangement exists, delivery has occurred and title has transferred, the price is fixed or determinable, and collection is reasonably assured, which is generally upon shipment. We accrue for estimated sales returns and other allowances, based on historical experience, at the time we recognize revenue.