Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Basis used to measure the fair value of financial instruments

The following table summarizes the basis used to measure the fair values of the Company’s financial instruments (amounts in thousands):

			Fair Value Measurements at Reporting Date, Using:
Description	June 30, 2016		Quoted Prices in Active Markets for Identical Items (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	156,294	$	156,294	$	—	$	—
Available-for-sale securities	1,480		—		—		1,480
Total assets	$	157,774	$	156,294	$	—	$	1,480
Purchase consideration payable	$	4,981	$	—	$	—	$	4,981
Total liabilities	$	4,981	$	—	$	—	$	4,981

Description	December 31, 2015		Quoted Prices in Active Markets for Identical Items (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash and cash equivalents	$	346,266	$	346,266	$	—	$	—
Available-for-sale securities	5,941		4,843				1,098
Total assets	$	352,207	$	351,109	$	—	$	1,098
Purchase consideration payable	$	4,967	$	—	$	—	$	4,967
Total liabilities	$	4,967	$	—	$	—	$	4,967