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Fair Value Measurements - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Total assets measured at fair value	$ 177,786	$ 168,129
Money market funds
Assets:
Money market funds	176,710	168,129
Equity warrant rights	1,076
Level 1
Assets:
Total assets measured at fair value	176,710	168,129
Level 1 | Money market funds
Assets:
Money market funds	176,710	168,129
Equity warrant rights	0
Level 2
Assets:
Total assets measured at fair value	0	0
Level 2 | Money market funds
Assets:
Money market funds	0	0
Equity warrant rights	0
Level 3
Assets:
Total assets measured at fair value	1,076	0
Level 3 | Money market funds
Assets:
Money market funds	0	$ 0
Equity warrant rights	$ 1,076

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- Definition

Equity Warrants, Fair Value Disclosure

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

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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