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Fair Value Measurements - (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair value of the Company's financial assets
Marketable Securities	$ 138,164,000		$ 207,254,000
Assets transferred into level 3	0	$ 0
Assets transferred out of level 3	0	$ 0
Corporate bonds
Fair value of the Company's financial assets
Marketable Securities	136,592,000		207,254,000
U.S. Government agencies
Fair value of the Company's financial assets
Marketable Securities	1,572,000
Fair Value
Fair value of the Company's financial assets
Total financial assets	152,565,000		209,934,000
Fair Value | Money market funds (cash equivalents)
Fair value of the Company's financial assets
Money market funds (cash equivalents)	14,401,000		2,680,000
Fair Value | Corporate bonds
Fair value of the Company's financial assets
Marketable Securities	136,592,000		207,254,000
Fair Value | U.S. Government agencies
Fair value of the Company's financial assets
Marketable Securities	1,572,000
Fair Value | Quoted Prices in Active Markets (Level 1)
Fair value of the Company's financial assets
Total financial assets	14,401,000		2,680,000
Fair Value | Quoted Prices in Active Markets (Level 1) | Money market funds (cash equivalents)
Fair value of the Company's financial assets
Money market funds (cash equivalents)	14,401,000		2,680,000
Fair Value | Significant Other Observable Inputs (Level 2)
Fair value of the Company's financial assets
Total financial assets	138,164,000		207,254,000
Fair Value | Significant Other Observable Inputs (Level 2) | Corporate bonds
Fair value of the Company's financial assets
Marketable Securities	136,592,000		$ 207,254,000
Fair Value | Significant Other Observable Inputs (Level 2) | U.S. Government agencies
Fair value of the Company's financial assets
Marketable Securities	$ 1,572,000

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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