Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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 three month periods ended March 31, 2019 and 2018 (in thousands):

Cash, Cash Equivalents, and Restricted Cash	Three Months Ended March 31,
	2019		2018
Cash and cash equivalents	$	184,090	$	309,377
Restricted cash	785		2,372
Total cash, cash equivalents, and restricted cash	$	184,875	$	311,749

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 three month periods ended March 31, 2019 and 2018 (in thousands):

Cash, Cash Equivalents, and Restricted Cash	Three Months Ended March 31,
	2019		2018
Cash and cash equivalents	$	184,090	$	309,377
Restricted cash	785		2,372
Total cash, cash equivalents, and restricted cash	$	184,875	$	311,749

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, 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	$	184,090	$	184,090	$	—	$	—
Nicox stock with lockup provisions	18		—		—		18
Total assets	$	184,108	$	184,090	$	—	$	18

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