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Net loss per share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net loss per share Net loss per share 
The following table sets forth the computation of the basic and diluted net loss per share attributable to NeoPhotonics Corporation common stockholders for the periods indicated (in thousands, except per share amounts): 
 
Years Ended December 31, 
 
2019
 
2018
 
2017
Numerator:
    
 
 
 
 
Net loss
(17,076
)
 
$
(43,637
)
 
$
(53,333
)
Denominator:
 
 
 

 
 

Weighted average shares used to compute per share amount:
 
 
 

 
 

Basic
47,304

 
45,144

 
43,431

Dilutive effect of equity awards
—

 
—

 
—

Diluted
47,304

 
45,144

 
43,431

Basic net loss per share
$
(0.36
)
 
$
(0.97
)
 
$
(1.23
)
Diluted net loss per share
$
(0.36
)
 
$
(0.97
)
 
$
(1.23
)
 
The Company has excluded the impact of the following outstanding employee stock options, restricted stock units, common stock warrants and shares expected to be issued under its employee stock purchase plan from the computation of diluted net loss per share, as their effect would have been antidilutive (in thousands):
 
December 31, 
 
2019
 
2018
 
2017
Employee stock options
2,599

 
3,203

 
3,934

Restricted stock units
3,171

 
2,486

 
2,405

Market-based restricted stock units
641

 
695

 
—

Employee stock purchase plan
298

 
414

 
421

 
6,709

 
6,798

 
6,760