Equity Incentive Plans and Stock Based Compensation - 2004 Employee Stock Purchase Plan (Detail) - 2004 Employee Stock Purchase Plan		12 Months Ended
	Jan. 01, 2017 shares	Dec. 31, 2023 item shares	Dec. 31, 2022 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional shares authorized for issuance	606
Offering period		24 months
Number of purchase periods | item		4
Purchase period		6 months
Discount available to eligible employees related to employee stock purchase plan		85.00%
Shares purchased by employees under purchase plan		0	0
Options to purchase shares of common stock available for future grants		576	576