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Cash and Cash Equivalents and Investments (Tables)

3 Months Ended

Mar. 31, 2014

Cash and Cash Equivalents and Investments [Abstract]

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

		As of March 31, 2014
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
		(in thousands)
Cash and cash equivalents		$	46,517			$	—			$	—			$	46,517
Securities maturing within one year:
Certificates of deposit		552				—				—				552
U.S. treasury securities		51,288				10				—				51,298
Total short-term investments		$	51,840			$	10			$	—			$	51,850
Total cash and cash equivalents and investments		$	98,357			$	10			$	—			$	98,367
		As of December 31, 2013
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
						(in thousands)
Cash and cash equivalents		$	37,499			$	—			$	—			$	37,499
Securities maturing within one year:
Certificates of deposit		552				—				—				552
U.S. treasury securities		91,075				3				(1		)		91,077
Total short-term investments		$	91,627			$	3			$	(1	)		$	91,629
Total cash and cash equivalents and investments		$	129,126			$	3			$	(1	)		$	129,128

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- Definition

Tabular disclosure of the components of cash, cash equivalents, and investments.

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