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Schedule of Changes in Estimated Fair Value of Warrant Liability (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Fair value measurements Significant unobservable inputs [Line Items]
Beginning balance			$ (40,483)
Change in estimated fair value of liability classified warrants	$ 7,083	$ (8,439)	20,307	$ 830
Ending balance	(20,176)		(20,176)
Fair Value, Measurements, Recurring [Member] | Level 3
Fair value measurements Significant unobservable inputs [Line Items]
Beginning balance			(40,483)	(17,613)
Change in estimated fair value of liability classified warrants			20,307	830
Ending balance	$ (20,176)	$ (16,783)	$ (20,176)	$ (16,783)

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- Definition

Fair Value Measurements, Significant Unobservable Inputs [Line Items]

+ References

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- Definition

Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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

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- Definition

Fair value portion of warrants not settleable in cash classified as equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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