Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Summary of Lease Assets and Liabilities

The following table summarizes the lease assets and liabilities as of December 31, 2019 (in thousands):

	As of December 31, 2019
Assets
Operating lease assets	$	41,502
Total lease assets		41,502
Liabilities
Current
Operating lease liabilities		8,489
Non-current
Operating lease liabilities, net of current portion		44,050
Total lease liabilities	$	52,539

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 twelve months ended December 31, 2019 (in thousands):

	Twelve Months Ended December 31, 2019
Operating lease costs	$	8,067
Short-term lease costs		4,554
Variable lease costs		4,282
Sublease income		(525	)
Net lease cost	$	16,378

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 December 31, 2019 (in thousands):

	Total
2020	$	13,963
2021		11,824
2022		10,167
2023		10,269
2024		8,308
Thereafter		15,678
Total	$	70,209
Present value adjustment		(17,670	)
Present value of lease liabilities	$	52,539

Summary of Lease Term and Discount Rate

The following table summarizes the lease term and discount rate as of December 31, 2019:

	As of December 31, 2019
Weighted-average remaining lease term (years)
Operating leases		6.0
Weighted-average discount rate
Operating leases		9.9	%

Lessee, Operating Lease Cash Flow Payments

The following table summarizes the cash paid for amounts included in the measurement of lease liabilities for the twelve months ended December 31, 2019 (in thousands):

	Twelve Months Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities	$	8,420
Operating cash flows from operating leases	$	8,420