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Stockholders' Equity - Additional Information (Detail) - $ / shares | Sep. 27, 2019 | Sep. 28, 2018 | Mar. 31, 2012
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Class of Warrant or Right [Line Items] |  |  |
Preferred stock, authorized (in shares) | 10,000,000 | 10,000,000 |
Preferred stock, par value (in USD per share) | $ 0.001 | $ 0.001 |
Common stock, authorized (in shares) | 300,000,000 | 300,000,000 |
Common stock, par value (in USD per share) | $ 0.001 | $ 0.001 |
Common stock, subject to forfeiture (in shares) | 0 | 6,100 |
Common stock warrants price per share (in USD per share) |  |  | $ 14.05
Common Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Common stock warrants (in shares) |  |  | 1,281,358

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