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Composition of Certain Financial Statement Items (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Accounts receivable (net of allowance for doubtful accounts of $0; 2011 - $0) $ 2,029 $ 730
Notes receivable (net of allowance for doubtful accounts of $0; 2011 - $186) 0 39
Lease receivable 46 148
Accounts, Notes, Loans and Financing Receivable, Net, Current $ 2,075 $ 917