Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Provision or benefit from income taxes	$ 0	$ 0	$ 0
Net operating loss carryforwards	246,200,000	171,900,000
Net operating loss and tax credit carryforwards	58,400,000	11,100,000
Unrecognized tax benefit	$ 0	0	0
Earliest Tax Year
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2033
Tax credit carryforwards, expiration year	2033
Tax Cuts and Jobs Act of 2017
Income Taxes [Line Items]
Increase in valuation allowance	$ 20,700,000	20,400,000	$ 9,800,000
Federal
Income Taxes [Line Items]
Tax credit carryforwards	14,800,000	10,900,000
State
Income Taxes [Line Items]
Tax credit carryforwards	$ 800,000	$ 600,000