Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

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	September 30, 2017		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	$	345,380	$	345,380	$	—	$	—
Nicox stock with lockup provisions	33		—		—		33
Total assets	$	345,413	$	345,380	$	—	$	33
Purchase consideration payable	$	4,994	$	—	$	—	$	4,994
Total liabilities	$	4,994	$	—	$	—	$	4,994

Description	December 31, 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	$	200,772	$	200,772	$	—	$	—
Available-for-sale securities	1,106		1,074		—		32
Total assets	$	201,878	$	201,846	$	—	$	32
Purchase consideration payable	$	4,994	$	—	$	—	$	4,994
Total liabilities	$	4,994	$	—	$	—	$	4,994