Investments

12 Months Ended

Dec. 31, 2012

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

4. Investments

The following table summarizes the Company’s cash, cash equivalents and investments as of December 31, 2012 and December 31, 2011:

	As of December 31, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Cash and cash equivalents:
Cash and money market funds	$	45,512	$	—	$	—		$	45,512
Investment Securities:
Commercial paper		12,971		10		(15	)		12,966
Corporate debt securities		41,866		7		(23	)		41,850
U.S. government and agency securities		9,861		4		—			9,865
Total investments		64,698		21		(38	)		64,681
Total cash, cash equivalents and investments	$	110,210	$	21	$	(38	)	$	110,193

	As of December 31, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Cash and cash equivalents:
Cash and money market funds	$	17,707	$	—	$	—	$	17,707

The following table shows the gross unrealized losses and fair value of the Company’s available-for-sale investments aggregated by investment category and length of time that individual securities have been in the position:

	As of December 31, 2012
	Less than 12 months
	(In thousands)
	Fair Value		Gross Unrealized Holding Losses
Commercial paper	$	10,461	$	(15	)
Corporate debt securities		29,834		(23	)
Total available-for-sale securities	$	40,295	$	(38	)