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Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Basic and diluted net income (loss) per share are calculated as follows (in thousands except share and per share data):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Basic and diluted net income (loss) per share
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
173

 
$
(1,807
)
 
$
(17,870
)
 
$
(26,009
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding - basic
76,618

 
72,707

 
75,611

 
72,550

Effect of dilutive potential common shares from stock options, stock awards and employee stock purchase plan
2,475

 

 

 

Weighted-average shares outstanding - diluted
79,093

 
72,707

 
75,611

 
72,550

Net income (loss) per share:
 
 
 
 
 
 
 
     Basic and diluted
$

 
$
(0.02
)
 
$
(0.24
)
 
$
(0.36
)
Summary of Anti-dilutive Shares
The following table presents common shares related to potentially dilutive shares excluded from the calculation of diluted net loss per share as their effect would have been anti-dilutive (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Stock options, restricted stock units and employee stock purchase rights
9,290

 
8,546

 
9,235

 
9,395