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Composition of Certain Financial Statement Items (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts receivable (net of allowance for doubtful accounts of $0; 2012 - $0) $ 1,305 $ 1,046
Notes receivable (net of allowance for doubtful accounts of $0; 2012 - $0) 10 10
Lease receivable 0 12
Accounts, Notes, Loans and Financing Receivable, Net, Current $ 1,315 $ 1,068