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Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets:    
Money market funds and time deposits $ 15,829 $ 10,855
Forward currency-exchange contracts 96 2
Interest rate swap agreement 65 62
Banker's acceptance drafts 16,687 7,852
Liabilities:    
Forward currency-exchange contracts 4 278
Level 1 [Member]    
Assets:    
Money market funds and time deposits 15,829 10,855
Forward currency-exchange contracts 0 0
Interest rate swap agreement 0 0
Banker's acceptance drafts 0 0
Liabilities:    
Forward currency-exchange contracts 0 0
Level 2 [Member]    
Assets:    
Money market funds and time deposits 0 0
Forward currency-exchange contracts 96 2
Interest rate swap agreement 65 62
Banker's acceptance drafts 16,687 7,852
Liabilities:    
Forward currency-exchange contracts 4 278
Level 3 [Member]    
Assets:    
Money market funds and time deposits 0 0
Forward currency-exchange contracts 0 0
Interest rate swap agreement 0 0
Banker's acceptance drafts 0 0
Liabilities:    
Forward currency-exchange contracts $ 0 $ 0