Fair Value of Financial Instruments - Hierarchy Table (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Fair value
Transfers between Level 2 and Level 3	$ 0	$ 0
Adjusted cost
Fair value
Cash and Cash Equivalents, Fair Value Disclosure	6,100	9,302
Assets, Fair Value Disclosure	110,713	37,114
Fair Value
Fair value
Cash and Cash Equivalents, Fair Value Disclosure	6,100	9,302
Assets, Fair Value Disclosure	110,713	37,114
Chesterbrook, Pennsylvania
Fair value
Letter of credit collateral	1,300
Cash and Cash Equivalents \| Fair Value
Fair value
Cash and Cash Equivalents, Fair Value Disclosure	4,790	7,993
Assets, Fair Value Disclosure	109,403	32,305
Restricted Cash \| Fair Value
Fair value
Cash and Cash Equivalents, Fair Value Disclosure	1,310	1,309
Assets, Fair Value Disclosure	1,310	1,309
Marketable Securities \| Fair Value
Fair value
Assets, Fair Value Disclosure		3,500
Level 1 \| Adjusted cost
Fair value
Investments, Fair Value Disclosure	104,613	24,302
Level 1 \| Fair Value
Fair value
Investments, Fair Value Disclosure	104,613	24,302
Level 1 \| Money market funds \| Adjusted cost
Fair value
Investments, Fair Value Disclosure	104,613	18,306
Level 1 \| Money market funds \| Fair Value
Fair value
Investments, Fair Value Disclosure	104,613	18,306
Level 1 \| U.S. treasury securities \| Adjusted cost
Fair value
Investments, Fair Value Disclosure		5,996
Level 1 \| U.S. treasury securities \| Fair Value
Fair value
Investments, Fair Value Disclosure		5,996
Level 1 \| Cash and Cash Equivalents \| Fair Value
Fair value
Investments, Fair Value Disclosure	104,613	20,802
Level 1 \| Cash and Cash Equivalents \| Money market funds \| Fair Value
Fair value
Investments, Fair Value Disclosure	$ 104,613	18,306
Level 1 \| Cash and Cash Equivalents \| U.S. treasury securities \| Fair Value
Fair value
Investments, Fair Value Disclosure		2,496
Level 1 \| Marketable Securities \| Fair Value
Fair value
Investments, Fair Value Disclosure		3,500
Level 1 \| Marketable Securities \| U.S. treasury securities \| Fair Value
Fair value
Investments, Fair Value Disclosure		3,500
Level 2 \| U.S. government agency securities \| Adjusted cost
Fair value
Investments, Fair Value Disclosure		3,510
Level 2 \| U.S. government agency securities \| Fair Value
Fair value
Investments, Fair Value Disclosure		3,510
Level 2 \| Cash and Cash Equivalents \| U.S. government agency securities \| Fair Value
Fair value
Investments, Fair Value Disclosure		$ 3,510

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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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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- Definition

Amount of assets pledged to secure a debt instrument.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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