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Cash and Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2013

Cash and Cash Equivalents and Investments [Abstract]

Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]

		As of March 31, 2013
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
		(in thousands)
Cash and cash equivalents		$	34,248			$	—			$	—			$	34,248
Securities maturing within one year:
Certificates of deposit		550				—				—				550
U.S. treasury securities		162,323				42				—				162,365
Total short-term investments		$	162,873			$	42			$	—			$	162,915
Total cash and cash equivalents and investments		$	197,121			$	42			$	—			$	197,163
		As of December 31, 2012
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
						(in thousands)
Cash and cash equivalents		$	30,423			$	—			$	—			$	30,423
Securities maturing within one year:
Certificates of deposit		551				—				—				551
U.S. treasury securities		192,211				24				(1		)		192,234
Total short-term investments		$	192,762			$	24			$	(1	)		$	192,785
Total cash and cash equivalents and investments		$	223,185			$	24			$	(1	)		$	223,208

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- Definition

Tabular disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities.

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No definition available.

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