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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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Common and Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		6 Months Ended
	Dec. 31, 2018	Feb. 28, 2018	Jun. 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			228,927,505			211,787,573
Common stock, shares outstanding			228,927,505			211,787,573
Preferred stock, shares outstanding			0			0
Common Stock \| June 2020 Note [Member]
Class Of Stock [Line Items]
Issuance of common stock to note holders			1,235,094,000
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			$ 12.9
Issuance of common stock (in shares)			7,871,461
At Market Issuance Sales Agreement \| Cantor Fitzgerald \| Common Stock \| Weighted Average
Class Of Stock [Line Items]
Exchange price per share			$ 1.64
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 \| 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 \| Warrants \| Maximum
Class Of Stock [Line Items]
Warrants to purchase common stock	26,666,667