Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Measurements [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	Assets and Liabilities at Fair Value as of September 30, 2015
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	61,674	$	—	$	—	$	61,674
Short-term investments	191,290		3,458		—		194,748
Total cash and cash equivalents and investments	$	252,964	$	3,458	$	—	$	256,422
Liabilities
Accrued liabilities	$	—	$	—	$	2,864	$	2,864
Other long-term liabilities	—		—		19,169		19,169
Total liabilities	$	—	$	—	$	22,033	$	22,033

	Assets and Liabilities at Fair Value as of December 31, 2014
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	137,266	$	—	$	—	$	137,266
Short-term investments	201,521		552		—		202,073
Total cash and cash equivalents and investments	$	338,787	$	552	$	—	$	339,339
Liabilities
Other long-term liabilities	$	—	$	—	$	17,638	$	17,638
Total liabilities	$	—	$	—	$	17,638	$	17,638

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at December 31, 2014	$	17,638
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	5,145
Payment of contingent payment obligation with cash	(750		)
Balance at September 30, 2015	$	22,033
Balance at December 31, 2013	$	27,710
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	518
Balance at June 30, 2014	$	28,228