FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Marketable securities:
Marketable securities	$ 2,967	$ 8,166
Carrying Value
Cash equivalents:
Money market funds	78,340	91,448
Marketable securities:
Marketable securities	2,967	8,166
Total financial assets	81,307	99,614
Liabilities:
Acquisition-related contingent consideration	(424,317)	(20,220)
Carrying Value \| Corporate bonds
Marketable securities:
Marketable securities	2,967	6,340
Carrying Value \| Government-sponsored enterprise securities
Marketable securities:
Marketable securities		1,826
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Cash equivalents:
Money market funds	78,340	91,448
Marketable securities:
Total financial assets	81,307	91,448
Recurring basis \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate bonds
Marketable securities:
Marketable securities	2,967
Recurring basis \| Significant Other Observable Inputs (Level 2)
Marketable securities:
Total financial assets		8,166
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Corporate bonds
Marketable securities:
Marketable securities		6,340
Recurring basis \| Significant Other Observable Inputs (Level 2) \| Government-sponsored enterprise securities
Marketable securities:
Marketable securities		1,826
Recurring basis \| Significant Unobservable Inputs (Level 3)
Liabilities:
Acquisition-related contingent consideration	(424,317)	(20,220)
Corporate bonds
Marketable securities:
Marketable securities	2,967	6,340
Government-sponsored enterprise securities
Marketable securities:
Marketable securities		$ 1,826

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details