Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Measurements

Schedule of financial assets and liabilities which are required to be measured at fair value

			Fair Value Measurements at Reporting Date
	Amount Recorded on Balance Sheet		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)	Significant Unobservable Inputs (Level 3)
Assets as of March 31, 2015:
Cash and cash equivalents	$	106,018	$	106,018	—	—
Short-term investments	$	30,494	$	30,494	—	—
Liabilities as of March 31, 2015:
Contingent consideration	$	1,967	—		—	$	1,967
Assets as of December 31, 2014:
Cash and cash equivalents	$	139,465	$	139,465	—	—
Short-term investments	$	30,992	$	30,992	—	—
Liabilities as of December 31, 2014:
Contingent consideration	$	6,922	—		—	$	6,922

Schedule of changes to the Company's contingent consideration liability Level 3 fair value measurements

	Significant Unobservable Inputs (Level 3)
	2015			2014
Contingent Consideration Liability
Beginning balance, January 1, 2015 and 2014	$	6,922		$	9,233
Additions to contingent consideration liability:
Change in fair value of contingent consideration liability	45			114
Reductions in the contingent consideration liability:
Payment to Q3C sellers for meeting performance targets	(5,000		)	(5,000		)
Ending balance, March 31, 2015 and 2014	$	1,967		$	4,347