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Stockholders' Equity - Additional Information - Employee Stock Purchase Plan (Detail) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 14, 2019 | May 14, 2019 | Nov. 16, 2018 | May 16, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Employee stock purchase plan expense |  |  |  |  | $ 31,848 | $ 17,738
Shares issued for Employee Stock Purchase Plan options, Value |  |  |  |  | $ 70,668 | $ 40,380
Common Stock [Member] |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Shares issued for Employee Stock Purchase Plan options, Shares |  |  |  |  | 44,035 | 26,415
Shares issued for Employee Stock Purchase Plan options, Value |  |  |  |  | $ 44 | $ 27
2014 Employee Stock Purchase Plan [Member] | Common Stock [Member] |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |
Shares issued for Employee Stock Purchase Plan options, Shares | 22,752 | 21,283 | 15,487 | 10,928 | 44,035 | 26,415
Shares issued for Employee Stock Purchase Plan options, Value | $ 40,999 | $ 29,669 | $ 21,984 | $ 18,396 | $ 70,668 | $ 40,380

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