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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Beginning balance - stock option liability $ 502 $ 811
Unrealized gain included in net loss (502) [1] (309) [1]
Ending balance- stock option liability $ 0 $ 502
[1] Included as a component of non-operating income (expense).