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Cash, Cash Equivalents and Short-Term Investments - Available-for-sale debt securities (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Amortized Cost	$ 230,140,000	$ 23,179
Unrealized Gains	83,000	173
Unrealized Losses	(1,092,000)	(43)
Fair Value	229,131,000	23,309
U.S. Treasury notes
Amortized Cost	230,140,000	23,179
Unrealized Gains	83,000	173
Unrealized Losses	(1,092,000)	(43)
Fair Value	$ 229,131,000	$ 23,309

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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