Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair Value of Financial Assets and Liabilities - (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 13, 2020	Dec. 31, 2020	Oct. 28, 2020	Dec. 31, 2019
Marketable securities:
Warrant to purchase preferred stock converted into warrant to purchase common stock	7,614		2,179,487
Warrant purchase price (in dollars per share)	$ 3.94		$ 0.0001
Conversion of stock shares issued	6,961
Recurring
Marketable securities:
U.S. Treasury obligations		$ 180,673		$ 121,140
Total assets		310,512		156,036
Recurring \| Money market funds
Assets:
Cash and cash equivalents		119,841		34,896
Recurring \| U.S. Treasury obligations
Assets:
Cash and cash equivalents		9,998
Recurring \| Level 1
Marketable securities:
U.S. Treasury obligations		180,673		121,140
Total assets		310,512		156,036
Recurring \| Level 1 \| Money market funds
Assets:
Cash and cash equivalents		119,841		$ 34,896
Recurring \| Level 1 \| U.S. Treasury obligations
Assets:
Cash and cash equivalents		$ 9,998