Investments (Tables)

6 Months Ended

Jun. 30, 2012

Investments [Abstract]

Amortized cost and gross unrealized gains and losses on all securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Short-term Investments:
U.S. Treasury securities and agency (taxable)	$	3,500	$	—	$	1	$	3,499
Corporate Notes and Bonds (taxable)		7,138		—		3		7,135
Commercial Paper (taxable)		19,297		—		3		19,294
Total short-term investments	$	29,935	$	—	$	7	$	29,928
Long-term Investments:
Peregrine Semiconductor, Corp. Series D-1 Preferred shares	$	2,000	$	—	$	—	$	2,000

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Short-term Investments:
U.S. Treasury securities and agency (taxable)	$	4,500	$	—	$	—	$	4,500
Corporate Notes/Bonds (taxable)		37,085		—		37		37,048
Commercial Paper (taxable)		8,992		—		12		8,980
Total short-term investments	$	50,577	$	—	$	49	$	50,528
Long-term Investments:
Peregrine Semiconductor, Corp. Series D-1 Preferred shares	$	2,000	$	—	$	—	$	2,000

Summarized financial assets measured at fair value on a recurring basis

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash Equivalents:
Money market funds	$	15,735	$	—	$	—	$	15,735
Investments:
Available-for-sales securities—current
U.S. Treasury securities and agency		—		3,499		—		3,499

	Level 1		Level 2		Level 3		Total
	(in thousands)
Corporate notes/bonds		—		7,135		—		7,135
Commercial paper		—		19,294		—		19,294
Total	$	15,735	$	29,928	$	—	$	45,663

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash Equivalents:
Money market funds	$	839	$	—	$	—	$	839
Investments:
Available-for-sales securities—current:
U.S. Treasury securities and agency		—		4,500		—		4,500
Corporate notes/bonds		—		37,048		—		37,048
Commercial paper		—		8,980		—		8,980
Total	$	839	$	50,528	$	—	$	51,367