Fair Value Measurement - Schedule of Assets Measured Fair Value on Recurring Basis (Detail) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	$ (71,636)
Total recurring fair value measurements	(63,664,000)	$ 8,810,000
Acquisition-related contingent consideration		(420,000)
Fair Value, Measurements, Recurring [Member] \| Equity Investments Measured at Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	2,207,000	4,183,000
Fair Value, Measurements, Recurring [Member] \| Debt Securities Classified as Available-for-Sale [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	5,765,000	5,047,000
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total recurring fair value measurements	3,051,000	4,910,000
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member] \| Equity Investments Measured at Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	2,207,000	4,183,000
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member] \| Debt Securities Classified as Available-for-Sale [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	844,000	727,000
Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	(71,636)
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	(71,636)
Total recurring fair value measurements	(66,715,000)	3,900,000
Acquisition-related contingent consideration		(420,000)
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member] \| Debt Securities Classified as Available-for-Sale [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	$ 4,921,000	$ 4,320,000

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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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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Fair value of asset after deduction of liability.

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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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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