Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Summary of Lease Assets and Liabilities

The following table summarizes the lease assets and liabilities as of September 30, 2019 (in thousands):

	As of September 30, 2019
Assets
Operating lease assets	$	30,619
Total lease assets		30,619
Liabilities
Current
Operating lease liabilities		4,805
Non-current
Operating lease liabilities, net of current portion		36,827
Total lease liabilities	$	41,632

Summary of Operating Lease Costs Included in Research and Development and General and Administrative Expense, as well as Sublease Income

The following table summarizes operating lease costs included in research and development and general and administrative expense, as well as sublease income for the three and nine months ended September 30, 2019 (in thousands):

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease costs	$	2,131	$	5,857
Short-term lease costs		1,117		3,378
Variable lease costs		698		2,111
Sublease income		—		(525	)
Net lease cost	$	3,946	$	10,821

Summary of Maturity of Undiscounted Payments Due under Lease Liabilities and Present Value of Those Liabilities

The following table summarizes the maturity of undiscounted payments due under lease liabilities and the present value of those liabilities as of September 30, 2019 (in thousands):

	Total
2019	$	1,997
2020		9,334
2021		8,816
2022		7,345
2023		7,363
Thereafter		23,254
Total	$	58,109
Present value adjustment		(16,477	)
Present value of lease liabilities	$	41,632

Summary of Lease Term and Discount Rate

The following table summarizes the lease term and discount rate as of September 30, 2019:

	As of September 30, 2019
Weighted-average remaining lease term (years)
Operating leases		6.8
Weighted-average discount rate
Operating leases		9.9	%

Summary of Cash Paid for Amounts Included in Measurement of Lease Liabilities

The following table summarizes the cash paid for amounts included in the measurement of lease liabilities for the nine months ended September 30, 2019 (in thousands):

	Nine Months Ended September 30,
	2019
Cash paid for amounts included in the measurement of lease liabilities	$	6,362
Operating cash flows from operating leases	$	6,362