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Notes Payable and Long-Term Debt - Term Debt - Narrative (Details) $ in Thousands										9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 21, 2018 CNY (¥)	Jun. 19, 2018 TWD ($)	Mar. 30, 2018 USD ($)	Sep. 28, 2017 USD ($)	Jun. 24, 2016 USD ($)	Jun. 14, 2016 USD ($)	May 27, 2015 TWD ($)	May 27, 2015 USD ($)	Sep. 30, 2018 USD ($)	Sep. 21, 2018 USD ($)	Jun. 19, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 25, 2016 USD ($)
Repayments of outstanding balance					$ 11,200					$ 125,678
Notes payable and long-term debt	$ 71,171									71,171			$ 49,559
Note payable	71,171									71,171
Unused borrowing capacity	63,600									63,600			1,000
Restricted Cash	$ 1,695									1,695			1,012
One Month LIBOR Rate
Interest rate description	LIBOR Borrowing Rate plus 1.88%
Basis spread on variable rate	2.26%
Taiwan Interbank Offered Rate [Member]
Notes payable and long-term debt	$ 3,300									3,300
Revolving Line of Credit 2
Revolving line of credit maximum borrowing capacity			$ 300,000,000									$ 9,800
Term of revolving credit facility			1 year
Revolving Line of Credit 2 \| Minimum
Draw term			90 days
Stated interest rate			1.95%									1.95%
Revolving Line of Credit 2 \| Maximum
Draw term			120 days
Stated interest rate			2.00%									2.00%
Loan facilities
Restricted Cash	0									0			0
Investments	0									0			0
Deposits	0									0			$ 0
East West Bank and Comerica Bank \| London Interbank Offered Rate (LIBOR) \| Modification Agreement
Interest rate description							LIBOR Borrowing Rate plus 2.0%
Basis spread on variable rate						2.00%	2.00%
East West Bank and Comerica Bank \| One Month LIBOR Rate \| Modification Agreement
Interest rate description							one-month LIBOR Borrowing Rate plus 2.75%
Basis spread on variable rate							2.75%
East West Bank and Comerica Bank \| First Amendment \| London Interbank Offered Rate (LIBOR) \| Modification Agreement
Interest rate description						LIBOR Borrowing Rate plus 2.0%
East West Bank \| Modification Agreement
Revolving line of credit maximum borrowing capacity							$ 22,000
China Construction Bank \| Revolving Line of Credit 4
Revolving line of credit maximum borrowing capacity		¥ 129,000,000									$ 18,800
Term of revolving credit facility		5 years
Notes payable and long-term debt	0									0
Chailease Finance Co. Ltd. \| Finance Lease 1
Lease purchase price								$ 180,148,532	$ 5,900
Initial payment amount								$ 60,148,532	2,000
Lease payment range price									$ 100
Financial lease term								3 years	3 years
Chailease Finance Co. Ltd. \| Finance Lease 1 \| Minimum
Lease payment range price								$ 3,322,413
Chailease Finance Co. Ltd. \| Finance Lease 1 \| Maximum
Lease payment range price								$ 3,784,000
Branch Banking and Trust Company \| First Credit Facility
Revolving line of credit maximum borrowing capacity					$ 50,000
Term of revolving credit facility					3 years
Branch Banking and Trust Company \| First Credit Facility \| One Month LIBOR Rate
Basis spread on variable rate					1.50%
Branch Banking and Trust Company \| Line of credit
Revolving line of credit maximum borrowing capacity				$ 60,000
Notes payable and long-term debt	33,300									33,300
Branch Banking and Trust Company \| Line of credit \| One Month LIBOR Rate
Interest rate description				one-month LIBOR plus
Branch Banking and Trust Company \| Line of credit \| One Month LIBOR Rate \| Minimum
Basis spread on variable rate				1.40%
Branch Banking and Trust Company \| Line of credit \| One Month LIBOR Rate \| Maximum
Basis spread on variable rate				2.00%
Revolving Line of Credit \| Revolving Line of Credit 2
Revolving line of credit maximum borrowing capacity	9,828									9,828
Notes payable and long-term debt	3,276									$ 3,276
Basis spread on variable rate										2.00%
Revolving Line of Credit \| East West Bank and Comerica Bank \| First Amendment
Revolving line of credit maximum borrowing capacity						$ 25,000								$ 40,000
Draw down period						1 year
Term of revolving credit facility						5 years
Revolving Line of Credit \| East West Bank and Comerica Bank \| First Amendment \| London Interbank Offered Rate (LIBOR)
Interest rate description							LIBOR Borrowing Rate plus 2.75% or 3.0%
Revolving Line of Credit \| East West Bank and Comerica Bank \| First Amendment \| London Interbank Offered Rate (LIBOR) \| Minimum
Basis spread on variable rate						2.75%
Revolving Line of Credit \| East West Bank and Comerica Bank \| First Amendment \| London Interbank Offered Rate (LIBOR) \| Maximum
Basis spread on variable rate						3.00%
Term Loan \| East West Bank and Comerica Bank \| First Amendment
Revolving line of credit maximum borrowing capacity						$ 10,000
Term Loan \| Branch Banking and Trust Company
Notes payable and long-term debt	20,600									$ 20,600
Term Loan \| Branch Banking and Trust Company \| One Month LIBOR Rate
Interest rate description				one-month LIBOR plus
Term Loan \| Branch Banking and Trust Company \| One Month LIBOR Rate \| Minimum
Basis spread on variable rate				1.15%
Term Loan \| Branch Banking and Trust Company \| One Month LIBOR Rate \| Maximum
Basis spread on variable rate				2.00%
Equipment Term Loan \| East West Bank and Comerica Bank \| First Amendment
Revolving line of credit maximum borrowing capacity						$ 10,000
Capital expenditure loan \| Branch Banking and Trust Company
Revolving line of credit maximum borrowing capacity				$ 26,000
Term of revolving credit facility				5 years
Notes payable and long-term debt	$ 14,000									$ 14,000
Capital expenditure loan \| Branch Banking and Trust Company \| One Month LIBOR Rate
Interest rate description				one-month LIBOR plus
Capital expenditure loan \| Branch Banking and Trust Company \| One Month LIBOR Rate \| Minimum
Basis spread on variable rate				1.30%
Capital expenditure loan \| Branch Banking and Trust Company \| One Month LIBOR Rate \| Maximum
Basis spread on variable rate				2.00%
Real estate term loan \| Branch Banking and Trust Company
Revolving line of credit maximum borrowing capacity				$ 21,500
Term of revolving credit facility				70 months