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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 |  |  |  |  |

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