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Common Stock, Preferred Stock and Warrants - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2017 | Aug. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Aug. 12, 2019 | Dec. 31, 2018
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock, shares outstanding |  |  | 83,865,119 | 83,865,119 |  | 62,862,000
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 from issuance or sale of equity |  | $ 65,600,000 |  |  |  |
Net cash proceeds received |  |  |  | $ 65,948,000 |  |
Preferred stock deemed dividend |  |  | $ 3,267,000 | 3,267,000 |  |
Increase in estimated fair value as loss on warrant liability |  |  |  | $ 234,000 |  |
Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock and preferred stock (in shares) |  |  | 18,525,000 | 19,912,000 |  |
Warrants |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Fair value of derivative liability |  |  | $ 7,600,000 | $ 7,600,000 | $ 7,400,000 |
Warrants | Other Income, Net |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Increase in estimated fair value as loss on warrant liability |  |  | $ 200,000 | $ 200,000 |  |
Offering |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Number of common stock allowed to purchase |  | 250 |  |  |  |
Combined price of common stock and warrant |  | $ 3.00 |  |  |  |
Net cash proceeds received from issuance or sale of equity |  | $ 65,600,000 |  |  |  |
Payment of issuance costs |  | $ 4,500,000 |  |  |  |
2017 ATM Agreement |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock and preferred stock (in shares) |  |  |  | 1,386,906 |  |
Net cash proceeds received |  |  |  | $ 13,900,000 |  |
Remaining proceeds from common stock, under sales agreement |  |  |  | $ 118,600,000 |  |
Series B Convertible Preferred Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock and preferred stock (in shares) |  | 4,840 |  |  |  |
Preferred stock, par value |  | $ 0.001 |  |  |  |
Preferred stock, shares outstanding |  |  | 4,840 | 4,840 |  | 0
Preferred stock deemed dividend |  |  |  | $ 3,300,000 |  |
Series B Convertible Preferred Stock | Common Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Number of common stock allowed to purchase |  |  | 1,000 | 1,000 |  |
Series B Convertible Preferred Stock | Offering |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Number of common stock allowed to purchase |  | 250 |  |  |  |
Combined price of preferred stock and warrant |  | $ 3,000 |  |  |  |
Maximum | Warrants |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Percentage of common stock to be held for exercise of warrants |  |  |  | 19.99% |  |
Maximum | Offering |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
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% |  |  |  |  |
Maximum | Series B Convertible Preferred Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Percentage of common stock to be held for conversion |  |  |  | 19.99% |  |
Minimum | Warrants |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Percentage of common stock to be held for exercise of warrants |  |  |  | 4.99% |  |
Minimum | Series B Convertible Preferred Stock |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Percentage of common stock to be held for conversion |  |  |  | 4.99% |  |

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