Components of Debt, Obligations, Weighted Average Interest Rate and Additional Fair Value Information Relating to Outstanding Debt Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Notes payable, carrying amount	$ 7,954	$ 12,003
Short-term debt, carrying amount	7,000	5,000
Total short-term debt, carrying amount	10,570	5,000
Long-term debt, carrying amount	19,250	17,167
Long term debt, non-current portion, carrying amount	26,390	17,167
Short-term Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.93%	2.20%
Long-term Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.93%	2.20%
NeoPhotonics Semiconductor
Debt Instrument [Line Items]
Notes payable, carrying amount	3,570
Long-term notes payable, carrying amount	$ 7,140
NeoPhotonics Semiconductor \| Notes Payable \| Short-term Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.50%
NeoPhotonics Semiconductor \| Notes Payable \| Long-term Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.50%

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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