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Price of common stock.

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proceeds from warrants sale.

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Selling commission percentage from gross offering proceeds of sales of stock.

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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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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Common Stock, Preferred Stock and Warrants - Additional Information (Detail) - USD ($)			1 Months Ended			3 Months Ended		9 Months Ended
	Aug. 06, 2020	Nov. 03, 2017	Aug. 31, 2021	May 31, 2020	Aug. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Common stock, shares outstanding						119,787,380		119,787,380			110,190,000
Issuance of common stock and preferred stock (in shares)					18,525,000
Common stock, par value					$ 0.001	$ 0.001		$ 0.001			$ 0.001
Preferred stock, par value						$ 0.001		$ 0.001			$ 0.001
Net cash proceeds received								$ 28,156,000	$ 108,537,000
Number of common stock warrants exercised						946,150		946,150
Change in fair value of warrant liability						$ 45,121,000	$ (21,245,000)	$ 68,576,000	$ (4,200,000)
Common Stock
Class Of Stock [Line Items]
Issuance of common stock and preferred stock (in shares)							109,000	2,879,000	24,215,000
Number of common stock allowed to purchase			4,140,000
Warrants
Class Of Stock [Line Items]
Warrants Called for purchase						4,895,000		4,895,000
Fair value of derivative liability						$ 72,000,000.0		$ 72,000,000.0
Warrants \| Other Income, Net
Class Of Stock [Line Items]
Change in fair value of warrant liability						$ 45,100,000	$ 21,200,000	$ 68,600,000	$ 4,200,000
Bain Life Sciences
Class Of Stock [Line Items]
Net cash proceeds received from issuance or sale of equity					$ 35,000,000.0
Bain Life Sciences \| Common Stock
Class Of Stock [Line Items]
Warrants Called for purchase										2,916,250
Proceeds From Warrants Sale										11.8
Offering
Class Of Stock [Line Items]
Issuance of common stock and preferred stock (in shares)				2,100,000
Common stock, par value				$ 0.001
Net cash proceeds received from issuance or sale of equity				$ 75,400,000	$ 65,600,000
Price of common stock				$ 5.00
Offering \| Bain Capital Life Sciences Fund, L.P
Class Of Stock [Line Items]
Issuance of common stock and preferred stock (in shares)				1,000,000
2017 ATM Agreement
Class Of Stock [Line Items]
Issuance of common stock and preferred stock (in shares)								2,878,567
Net cash proceeds received								$ 28,200,000
Remaining proceeds from common stock, under sales agreement								$ 120,500,000
Series B Convertible Preferred Stock
Class Of Stock [Line Items]
Issuance of common stock and preferred stock (in shares)			4,140		4,840
Preferred stock, par value					$ 0.001
Preferred stock, shares outstanding						0		0			4,000
Maximum
Class Of Stock [Line Items]
Common stock sales agreement aggregate sales proceeds	$ 150,000,000
Maximum \| Warrants
Class Of Stock [Line Items]
Percentage of common stock held not to exceed for warrant exercises								19.99%
Maximum \| Offering
Class Of Stock [Line Items]
Issuance of common stock and preferred stock (in shares)				16,100,000
Warrant issued					5,841,250
Maximum \| 2017 ATM Agreement
Class Of Stock [Line Items]
Common stock sales agreement aggregate sales proceeds		$ 150,000,000
Commission on gross sales proceeds of common stock		3.00%
Minimum \| Warrants
Class Of Stock [Line Items]
Percentage of common stock to be held for exercise of warrants								4.99%