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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value Measurement, Cash Equivalent
Gross amortized cost	$ 2,817	$ 2,009
Gross unrealized gains
Gross unrealized (losses)
Estimated fair value	2,817	2,009
Commercial paper
Fair Value Measurement, Cash Equivalent
Gross amortized cost	2,817	2,009
Gross unrealized gains
Gross unrealized (losses)
Estimated fair value	$ 2,817	$ 2,009

X

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

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