Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax [Line Items]
Income tax expense (benefit)	$ 154,000	$ 2,881,000
Federal
Income Tax [Line Items]
Income tax expense (benefit)	0
Taiwan
Income Tax [Line Items]
Income tax expense (benefit)	$ 100,000