Restructuring Costs - Additional Information (Detail)	1 Months Ended		12 Months Ended
	Oct. 31, 2019 Employee	May 31, 2019 Employee	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs			$ 2,343,000
Restructuring costs paid			1,507,000
Accrued restructuring charges			461,000
Severance Plan [Member]
Restructuring Cost And Reserve [Line Items]
Number of workforce elimination | Employee		38
Severance Plan [Member] | Taiwan [Member]
Restructuring Cost And Reserve [Line Items]
Number of workforce expected to be eliminated | Employee	17
Severance and Benefits and Non-cash Impairment Charge [Member]
Restructuring Cost And Reserve [Line Items]
Aggregate restructuring charges			2,300,000
Restructuring costs			2,300,000	$ 0
Restructuring costs paid			1,500,000
Accrued restructuring charges			$ 500,000