Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

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 six month periods ended June 30, 2019 and 2018 (in thousands):

Cash, Cash Equivalents, and Restricted Cash	Six Months Ended June 30,
	2019		2018
Cash and cash equivalents	$	178,264	$	296,782
Restricted cash	803		837
Total cash, cash equivalents, and restricted cash	$	179,067	$	297,619

Restrictions on Cash and Cash Equivalents

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 six month periods ended June 30, 2019 and 2018 (in thousands):

Cash, Cash Equivalents, and Restricted Cash	Six Months Ended June 30,
	2019		2018
Cash and cash equivalents	$	178,264	$	296,782
Restricted cash	803		837
Total cash, cash equivalents, and restricted cash	$	179,067	$	297,619

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, 2019		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	$	178,264	$	178,264	$	—	$	—
Nicox stock with lockup provisions	15		—		—		15
Total assets	$	178,279	$	178,264	$	—	$	15

Description	December 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	$	224,868	$	224,868	$	—	$	—
Nicox stock with lockup provisions	18		—		—		18
Total assets	$	224,886	$	224,868	$	—	$	18