Fair Value Measurement - Schedule of Assets Measured Fair Value on Recurring Basis (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	$ (122,804,000)	$ (120,647,000)
Convertible Debt	(269,223,000)	(239,652,000)
Total recurring fair value measurements	(391,394,000)	(357,322,000)
Fair Value, Measurements, Recurring [Member] \| Equity Investments Measured at Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	633,000	477,000
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		2,500,000
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total recurring fair value measurements	633,000	477,000
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	633,000	477,000
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Convertible Debt	(269,223,000)	(239,652,000)
Total recurring fair value measurements	(269,223,000)	(239,652,000)
Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	(122,804)
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Warrant liability	(122,804,000)	(120,647,000)
Total recurring fair value measurements	$ (122,804,000)	(118,147,000)
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		$ 2,500,000

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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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