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Remaining Warrants Available for Purchase.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 505
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Common and Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended		9 Months Ended
	Oct. 09, 2020	Jun. 24, 2020	Dec. 31, 2018	Feb. 28, 2018	Sep. 30, 2020	May 21, 2020	May 20, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Common stock, shares authorized					400,000,000	400,000,000	280,000,000	280,000,000
Common stock, shares issued					230,922,513			211,787,573
Common stock, shares outstanding					230,922,513			211,787,573
Preferred stock, shares outstanding					0			0
Common Stock \| June 2020 Note
Class Of Stock [Line Items]
Issuance of common stock to note holders		1,235,094,000
Common Stock \| December 2020 Note \| Subsequent Event
Class Of Stock [Line Items]
Issuance of common stock to note holders	1,377,356,000
Controlled Equity Offering Sales Agreement \| Cantor Fitzgerald
Class Of Stock [Line Items]
Stock sales agreements date				2018-02
Controlled Equity Offering Sales Agreement \| Cantor Fitzgerald \| Common Stock \| Maximum
Class Of Stock [Line Items]
Amount of net proceeds from issuance of securities				$ 50.0
At Market Issuance Sales Agreement \| Cantor Fitzgerald \| Common Stock
Class Of Stock [Line Items]
Amount of net proceeds from issuance of securities					$ 15.6
Issuance of common stock (in shares)					9,401,827
At Market Issuance Sales Agreement \| Cantor Fitzgerald \| Common Stock \| Weighted Average
Class Of Stock [Line Items]
Exchange price per share					$ 1.66
Underwriting Agreement with Leerink Partners LLC
Class Of Stock [Line Items]
Warrants expiration, date			Dec. 26, 2019
Warrants expired unexercised			11,583,333,000
Remaining warrants available for purchase			7,250,000,000
Underwriting Agreement with Leerink Partners LLC \| Common Stock
Class Of Stock [Line Items]
Exchange price per share			$ 1.50
Underwriting Agreement with Leerink Partners LLC \| Common Stock \| Public Offering
Class Of Stock [Line Items]
Issuance of common stock (in shares)			26,666,667
Underwriting Agreement with Leerink Partners LLC \| Exercise of Common Stock Warrants
Class Of Stock [Line Items]
Exercise price of warrants			$ 1.60
Remained available warrants expiration period			2020-06
Underwriting Agreement with Leerink Partners LLC \| Exercise of Common Stock Warrants \| Maximum
Class Of Stock [Line Items]
Warrants to purchase common stock			26,666,667