Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value, Balance Sheet Grouping, Financial Statement Captions

Fair Value, by Balance Sheet Grouping

	Assets and Liabilities at Fair Value
	As of December 31, 2013
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	37,499	$	—	$	—	$	37,499
Short-term investments	91,077		552		—		91,629
Total cash and cash equivalents and investments	$	128,576	$	552	$	—	$	129,128
Liabilities
Other long-term liabilities	$	—	$	—	$	27,710	$	27,710
Total liabilities	$	—	$	—	$	27,710	$	27,710

	Assets and Liabilities at Fair Value
	As of December 31, 2012
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	30,423	$	—	$	—	$	30,423
Short-term investments	192,234		551		—		192,785
Total cash and cash equivalents and investments	$	222,657	$	551	$	—	$	223,208
Liabilities
Other long-term liabilities	$	—	$	—	$	29,920	$	29,920
Total liabilities	$	—	$	—	$	29,920	$	29,920

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

	Other Long-term Liabilities
	(in thousands)
Balance at December 31, 2010	$	48,267
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	6,766
Balance at December 31, 2011	55,033
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	9,887
Payment of base payment obligation with common stock	(35,000		)
Balance at December 31, 2012	29,920
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	(2,210		)
Balance at December 31, 2013	$	27,710