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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 11, 2019 | Feb. 28, 2018 | Jan. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Feb. 15, 2018
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Gross proceeds on sale of shares of common stock |  |  | $ 10,000,000 |  |  |  | $ 1,100,000 |
Aggregate commission rate |  |  | 3.00% |  |  |  |  |
Common stock, shares issued and sold (in shares) | 5,261,250 | 5,000,000 |  | 0 | 0 | 0 | 375,000 |
Issuance costs incurred |  |  |  |  |  |  | $ 237,403 |
Warrants to purchase common stock (in shares) |  | 3,500,000.0 |  | 30,333 |  | 30,333 |  |
Amount recorded to additional paid in capital as a result of triggered anti-diluted provisions |  |  |  | $ 789,594 | $ 0 | $ 789,594 | $ 0 |
Warrants exercised (in shares) |  |  |  |  |  | 0 | 0 |
Underwritten Offering |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued and sold (in shares) | 686,250 | 220,500 |  |  |  |  |  |
Warrants to purchase common stock (in shares) |  | 525,000 |  |  |  |  |  |
Underwriters overallotment option to purchase additional shares of common stock and warrants period | 30 days | 30 days |  |  |  |  |  |
Underwriters option to purchase additional shares (in shares) |  | 750,000 |  |  |  |  |  |
Gross proceeds from offering of common stock and warrants | $ 5,800,000 | $ 10,300,000 |  |  |  |  |  |
Proceeds received in public offering, net of underwriting discounts and offering expenses | $ 5,200,000 | $ 9,400,000 |  |  |  |  |  |
Exercise price (in usd per share) |  | $ 3.00 |  |  |  |  |  |
Public Stock Offering |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued and sold (in shares) | 4,575,000 |  |  |  |  |  |  |
Public offering price in the Offering (in usd per share) | $ 1.10 | $ 0.70 |  |  |  |  |  |
Warrants Expiring on February 15, 2023 |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Exercise price (in usd per share) | $ 0.98 |  |  | $ 0.98 |  | $ 0.98 |  |
Accounting Standards Update 2017-11 |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Estimated fair value of warrants recorded in equity |  |  |  |  |  |  |  | $ 3,000,000

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