Financial Instruments and Fair Value Measurements - Equity Investment in ImaginAb (Details) - ImaginAb $ in Millions	Mar. 18, 2021 USD ($) shares	Sep. 30, 2021 USD ($) Director
Equity Investment
Transaction costs to acquire equity securities	$ 0.4
Equity investment ownership percentage		12.50%
Number of Investee's Board members currently representing the Company \| Director		1
Number of the Investee's Board members \| Director		5
Equity and long-term investments at fair value		$ 6.4
Series C preferred stock
Equity Investment
Number of shares to be purchased under the securities purchase agreement \| shares	4,051,724
Amount of securities purchase agreement	$ 4.7
One of ImaginAb's Common Stockholders \| Common stock
Equity Investment
Number of shares to be purchased under the securities purchase agreement \| shares	4,097,157
Amount of securities purchase agreement	$ 1.3

The total number of Board members of the Investee.

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- Definition

The number of the Company's Board members currently serving on the Investee's Board.

+ References

No definition available.

+ Details

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- Definition

The amount the Company agreed to pay for common stock and warrants upon satisfaction of certain closing conditions under the terms of the securities purchase agreement.

+ References

No definition available.

+ Details

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- Definition

The total number of shares to be purchased under the terms of a securities purchase agreement.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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- Definition

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.

+ References

No definition available.

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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