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Net Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the calculation of basic and diluted net loss per share:
 
Three Months Ended
 
March 31, 2019
 
April 1, 2018
Basic net loss per share:
 
 
 
Net loss
$
(11,469
)
 
$
(3,102
)
Weighted average common shares outstanding
36,045,137

 
35,665,811

Basic net loss per share
$
(0.32
)
 
$
(0.09
)
Diluted net loss per share:
 
 
 
Net loss
$
(11,469
)
 
$
(3,102
)
Shares used in computing diluted net loss per share
36,045,137

 
35,665,811

Diluted net loss per share
$
(0.32
)
 
$
(0.09
)
Shares excluded from diluted net loss per share computations (1)
10,307,431

 
10,233,980



(1) Shares issuable upon conversion of preferred stock and non-vested shared were excluded from the computation of diluted net loss per share because their effect would have been anti-dilutive.