Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Short-term debt	$ 70,746	$ 13,342
Total long-term debt	348,183	98,641
Less: Current portion of long-term debt	(14,978)	(33,105)
Less: Unamortized debt costs	(2,439)	(1,135)
Long-term debt, net of current portion	$ 330,766	64,401
Debt instrument, interest rate description	Libor + Margin
Debt Instrument, maturity date, description	Various during 2020 - 2021
Notes Payable to Bank \| Bank of Taiwan \| June-33
Debt Instrument [Line Items]
Total long-term debt	$ 4,142	4,242
Debt instrument, interest rate description	Variable, 1.3% base
Long-term variable interest rate	1.30%
Debt Instrument, maturity date, description	June-33
Notes Payable to Bank \| China Trust Bank \| December-21
Debt Instrument [Line Items]
Total long-term debt	$ 3,436
Debt instrument, interest rate description	Taibor 3 month rate + 0.5%
Debt Instrument, maturity date, description	December-21
Notes Payable to Bank \| China Trust Bank \| May-24
Debt Instrument [Line Items]
Total long-term debt	$ 16,357	19,212
Debt instrument, interest rate description	Taibor 3 month rate + 0.5%
Debt Instrument, maturity date, description	May-24
Notes Payable to Bank \| E Sun Bank \| December-22
Debt Instrument [Line Items]
Total long-term debt	$ 3,436
Debt instrument, interest rate description	1-M deposit rate plus 0.08%
Debt Instrument, maturity date, description	December-22
Notes Payable to Bank \| E Sun Bank \| June-27
Debt Instrument [Line Items]
Total long-term debt	$ 378
Debt instrument, interest rate description	1-M deposit rate plus 0.08%
Debt Instrument, maturity date, description	June-27
Notes Payable to Bank \| E Sun Bank \| June-30
Debt Instrument [Line Items]
Total long-term debt	$ 1,684
Debt instrument, interest rate description	1-M deposit rate plus 0.08%
Debt Instrument, maturity date, description	June-30
Term Loan and Revolver
Debt Instrument [Line Items]
Total long-term debt	$ 318,750	$ 75,187
Debt instrument, interest rate description	Libor plus margin
Debt Instrument, maturity date, description	May-23

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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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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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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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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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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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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