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Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 28, 2018 | Jan. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Feb. 15, 2018
Stockholders Equity [Line Items] |  |  |  |  |
Gross proceeds on sale of shares of common stock |  |  |  | $ 1,100,000 |
Issuance costs |  |  | $ 237,403 |  |
Common stock, shares issued and sold (in shares) | 5,000,000 |  | 0 | 375,000 |
Price per share (in usd per share) | $ 0.70 |  |  |  |
Class of warrant or right exercisable period | 5 years |  |  |  |
Warrants exercised (in shares) |  |  | 0 | 0 |
Accounting Standards Update 2017-11 [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Estimated fair value of warrants, recorded in equity |  |  |  |  | $ 3,000,000
Maximum [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Gross proceeds on sale of shares of common stock |  | $ 10,000,000 |  |  |
Aggregate commission rate |  | 3.00% |  |  |
Warrants to purchase common stock (in shares) | 3,500,000.0 |  |  |  |
Underwritten Offering [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Underwriters overallotment option to purchase additional shares of common stock and warrants period | 30 days |  |  |  |
Gross proceeds from offering of common stock and warrants | $ 10,300,000 |  |  |  |
Proceeds from offering of common stock and warrants, net of costs | $ 9,400,000 |  |  |  |
Exercise price (in usd per share) | $ 3.00 |  |  |  |
Underwritten Offering [Member] | Maximum [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Common stock, shares issued and sold (in shares) | 220,500 |  |  |  |
Warrants to purchase common stock (in shares) | 525,000 |  |  |  |
Underwriters option to purchase additional shares (in shares) | 750,000 |  |  |  |

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