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Stockholders' Equity - Additional Information (Detail) - $ / shares | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |
Warrants outstanding | 51,449 |
Exercise price of warrants for common stock | $ 0.01 |
Common stock warrants exercised, Shares | 363,638 | 246,793

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