Fair Value Measurement - Schedule of Assets and Liabilities Measured Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	$ (120,647)
Acquisition-related contingent consideration		$ 420
Convertible Debt	(239,652)
Total recurring fair value measurements	(357,322)	9,650
Fair Value, Measurements, Recurring [Member] \| Equity Investments Measured at Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	477	4,183
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	2,500	5,047
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total recurring fair value measurements	477	4,910
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	477	4,183
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		727
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Convertible Debt	(239,652)
Total recurring fair value measurements	(239,652)
Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	(120,647)
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	(120,647)
Acquisition-related contingent consideration		420
Total recurring fair value measurements	(118,147)	4,740
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	$ 2,500	$ 4,320

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

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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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
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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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