Assumptions for Measuring Fair Values of Stocks (Detail)		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected dividend yield		0.00%
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, minimum	[1]	1.60%		0.40%		0.10%
Risk-free interest rate, maximum		4.20%	[1]	1.30%	[1]	1.30%	[1]	2.50%	3.00%
Expected dividend yield	[2]	0.00%		0.00%
Expected term	[3]	5 years 1 month 2 days		4 years 11 months 26 days		5 years
Expected volatility, minimum	[4]	52.40%		60.10%		57.30%
Expected volatility, maximum		72.90%	[4]	70.80%	[4]	68.20%	[4]	68.90%	60.80%

[1] The risk-free interest rate is estimated using an average of Treasury bill interest rates over a historical period commensurate with the expected term of the option that correlates to the prevailing interest rates at the time of grant.

[2] The expected dividend yield is zero as the Company has not paid any dividends to date and does not expect to pay dividends in the future.

[3] The expected term is estimated using historical exercise behavior.

[4] The expected volatility is the implied volatility in exchange-traded options of the Company’s common stock.