Digital Assets - Additional Information (Detail)	3 Months Ended	6 Months Ended	12 Months Ended
Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Bitcoin	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Intangible Assets Net Excluding Goodwill [Abstract]
Number of bitcoins purchased \| Bitcoin				70,469
Purchases of digital assets, amount			$ 1,125,000,000	$ 1,125,000,000	$ 0	$ 0
Digital asset impairment losses	$ 26,500,000	$ 44,200,000		70,698,000	0	$ 0
Digital assets	$ 1,054,302,000		$ 1,054,302,000	1,054,302,000	$ 0
Cumulative impairment of digital assets				70,700,000
Sale of digital assets				$ 0

Cumulative Impairment of Intangible Assets (Excluding Goodwill).

No definition available.

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- Definition

Gain loss on sale of digital assets.

+ References

No definition available.

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- Definition

Number of bitcoins purchased.

+ References

No definition available.

+ Details

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- References

No definition available.

+ Details

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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