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Equity Investment
12 Months Ended
Dec. 31, 2011
Equity Investment [Abstract]  
Equity Investment
7. EQUITY INVESTMENT

On October 11, 2007, the Company purchased an approximately 27% fully diluted equity interest in Zero Technologies, LLC ("Zero Water"), at a purchase price of $14,258. This investment was accounted for under the equity method of accounting. In June 2009, the Company abandoned its interest in Zero Water as management determined that the business was no longer aligned with the Company's strategic direction. An equity and impairment loss of $4,000 was recorded to write-off the remaining investment.