Marketable Securities	12 Months Ended
Marketable Securities	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Current Marketable Securities	Current Marketable Securities The Company had current marketable securities of $124,873 at December 31, 2012, consisting of short-term corporate debt securities with maturities exceeding three months at the date of acquisition. These debt securities are classified as held-to-maturity and are carried at amortized cost, which approximates their fair value. The Company has a policy of making investments only with commercial institutions that have at least an A2/P2 short-term credit rating.

- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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