Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Summary of Components of Lease Expense

The components of the Company’s lease expense are as follows:

Lease Costs	Classification	Year Ended December 31, 2019
Operating lease cost	R&D Expense		2,312
	G&A Expense		899
Variable lease costs (1)	R&D Expense		707
	G&A Expense		276
Total lease cost			4,194
Weighted-average remaining lease term (in months)			119.6
Weighted-average discount rate			10.5	%

(1) Variable lease costs include certain additional charges for operating costs, including insurance, maintenance, taxes, utilities, and other costs incurred, which are billed based on both usage and as a percentage of the Company’s share of total square footage. Short term lease costs are immaterial.

Schedule of Maturities of Operating Lease Liabilities

As of December 31, 2019, the maturities of the Company’s operating lease liabilities were as follows:

Year Ending December 31,
2020		3,796
2021		5,529
2022		5,385
2023		5,413
2024		5,533
Thereafter		31,827
Total future lease payments		57,483
Less: Interest		(37,553	)
Present value of future lease payments (lease liability)	$	19,930

Schedule of Future Minimum Lease Payments

Future minimum lease payments for the Company’s operating leases as of December 31, 2018 were as follows:

Year Ending December 31,
2019		2,546
2020		4,258
2021		5,176
2022		5,292
2023		5,376
Thereafter		37,573
	$	60,221