Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

The following table sets forth the components of the Company’s Cash, cash equivalents, and restricted cash as reported in the consolidated statement of cash flows for the three month periods ended March 31, 2018 and 2017 (in thousands):



Cash, Cash Equivalents, and Restricted Cash	Three Months Ended March 31,
	2018		2017
Cash and cash equivalents	$	309,377	$	307,425
Restricted cash	2,372		2,505
Total cash, cash equivalents, and restricted cash	$	311,749	$	309,930

Restrictions on Cash and Cash Equivalents



Cash, Cash Equivalents, and Restricted Cash	Three Months Ended March 31,
	2018		2017
Cash and cash equivalents	$	309,377	$	307,425
Restricted cash	2,372		2,505
Total cash, cash equivalents, and restricted cash	$	311,749	$	309,930

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	March 31, 2018		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	$	309,377	$	309,377	$	—	$	—
Nicox stock with lockup provisions	34		—		—		34
Total assets	$	309,411	$	309,377	$	—	$	34

Purchase consideration payable	$	201	$	—	$	—	$	201
Total liabilities	$	201	$	—	$	—	$	201



Description	December 31, 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	$	368,119	$	368,119	$	—	$	—
Nicox stock with lockup provisions	35		—		—		35
Total assets	$	368,154	$	368,119	$	—	$	35

Purchase consideration payable	$	3,901	$	—	$	—	$	3,901
Total liabilities	$	3,901	$	—	$	—	$	3,901