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Cover Page - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-35061    
Entity Registrant Name NeoPhotonics Corp    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3253730    
Entity Address, Address Line One 3081 Zanker Road    
Entity Address, City or Town San Jose    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95134    
City Area Code 408    
Local Phone Number 232-9200    
Title of 12(b) Security Common Stock, par value $0.0025 per share    
Trading Symbol  NPTN    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 193,407
Entity Common Stock, Shares Outstanding   48,636,526  
Documents Incorporated by Reference
The Registrant has incorporated by reference into Part III of this Annual Report on Form 10-K portions of its Proxy Statement for its 2019 Annual Meeting of Stockholders to be filed pursuant to Regulation 14A. The Proxy Statement will be filed within 120 days of Registrant’s fiscal year ended December 31, 2019.
    
Entity Central Index Key 0001227025    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false