Debt - Components of Debt Obligations and Weighted Average Interest Rate (Details) $ in Thousands, ¥ in Billions	Sep. 30, 2017 JPY (¥)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Short-term debt		$ 19,630	$ 30,190
Unaccreted discount and issuance costs within current portion of long-term debt		(103)	(108)
Unaccreted discount and issuance costs within long-term debt, net of current portion		(314)	(183)
Total long-term debt, net of unaccreted discount and issuance costs		46,769	10,962
Current portion of long-term debt		5,740	747
Long-term debt, net of current portion		41,029	10,215
Line of Credit | Wells Fargo Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross		$ 30,018	0
Weighted average interest rate	3.16%	3.16%
Notes Payable to Banks | Mitsubishi Bank Loans
Debt Instrument [Line Items]
Long-term debt, gross		$ 17,168	$ 11,253
Total long-term debt, net of unaccreted discount and issuance costs | ¥	¥ 1.2
Weighted average interest rate	1.44%	1.44%	1.43%
Notes Payable to Banks | Notes Payable CITIC Bank
Debt Instrument [Line Items]
Short-term debt		$ 17,000	$ 0
Weighted average interest rate	4.06%	4.06%
Notes payable to suppliers | Loans With Suppliers
Debt Instrument [Line Items]
Short-term debt		$ 2,630	6,390
Line of Credit | Amended Comerica Bank Credit Facility
Debt Instrument [Line Items]
Short-term debt		$ 0	$ 23,800
Weighted average interest rate			3.37%