Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 238,445	$ 312,247
Less: Current portion of long-term debt	(18,404)	(21,860)
Less: Unamortized debt costs	(2,041)	(2,208)
Long-term debt, net of current portion	218,000	288,179
Various during 2021 - 2022
Debt Instrument [Line Items]
Short-term debt	$ 15,690	140,563
Short-term debt, Interest Rate	Libor plus margin
Notes Payable to Bank \| Bank of Taiwan \| June 2033
Debt Instrument [Line Items]
Total long-term debt	$ 2,526	4,154
Long-term debt, Interest Rate	Variable, 1.3% base
Notes Payable to Bank \| Bank of Taiwan \| September 2023
Debt Instrument [Line Items]
Total long-term debt	$ 1,793
Long-term debt, Interest Rate	2-yr deposit rate floating
Notes Payable to Bank \| China Trust Bank \| May 2024
Debt Instrument [Line Items]
Total long-term debt	$ 16,400	16,714
Long-term debt, Interest Rate	Taibor 3 month rate + 0.5%
Notes Payable to Bank \| China Trust Bank \| December 2021
Debt Instrument [Line Items]
Total long-term debt	$ 3,589	3,511
Long-term debt, Interest Rate	Taibor 3 month rate + 0.5%
Notes Payable to Bank \| E Sun Bank \| December 2022
Debt Instrument [Line Items]
Total long-term debt	$ 3,589	3,511
Long-term debt, Interest Rate	1-M deposit rate plus 0.08%
Notes Payable to Bank \| E Sun Bank \| June 2027
Debt Instrument [Line Items]
Total long-term debt	$ 384	386
Long-term debt, Interest Rate	1-M deposit rate plus 0.08%
Notes Payable to Bank \| E Sun Bank \| June 2030
Debt Instrument [Line Items]
Total long-term debt	$ 1,759	1,721
Long-term debt, Interest Rate	1-M deposit rate plus 0.08%
Notes Payable to Bank \| HSBC \| January 2023
Debt Instrument [Line Items]
Total long-term debt	$ 100,000
Long-term debt, Interest Rate	Libor plus margin
Term Loan and Revolver \| May 2024
Debt Instrument [Line Items]
Total long-term debt	$ 108,405	$ 282,250
Long-term debt, Interest Rate	Libor plus margin

Long-term debt, interest rate.

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Short-term debt, interest rate.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, before accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the operating cycle if longer, excluding current portion.

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