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Stockholders' Equity - Additional Information (Detail) - $ / shares	Sep. 27, 2019	Sep. 28, 2018	Mar. 31, 2012
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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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