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Net Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Weighted Average Number of Common Shares Outstanding
For purposes of this calculation, common stock subject to repurchase by the Company, options, performance-based restricted stock units and warrants are considered to be common stock equivalents and are only included in the calculation of diluted earnings per share when their effect is dilutive (in thousands, except per share data):
 
 
Three Months Ended 
 March 31,
 
2016
 
2015
Numerator:
 
 
 
Net loss for basic earnings per share
$
(6,617
)
 
$
(4,561
)
Decrease in fair value of warrants
—

 
—

Diluted net loss applicable to common stockholders
$
(6,617
)
 
$
(4,561
)
Denominator:
 
 
 
Weighted average common shares outstanding
102,151

 
99,849

Weighted average unvested common shares subject to repurchase
(565
)
 
(829
)
Weighted average common shares outstanding—basic
101,586

 
99,020

Effect of dilutive securities:
 
 
 
Conversion of preferred stock
—

 
—

Options
—

 
—

Warrants
—

 
—

Weighted average common shares outstanding—diluted
101,586

 
99,020

Net loss per share:
 
 
 
Basic and diluted
$
(0.07
)
 
$
(0.05
)
Weighted-Average Anti-Dilutive Securities Not Included in Diluted Net Loss Per Share
The anti-dilutive securities not included in diluted net loss per share were as follows (in thousands):
 
 
Three Months Ended 
 March 31,
 
2016
 
2015
Options to purchase common stock
7,547

 
7,318

Unvested restricted share awards
565

 
829

Warrants to purchase common stock
11,544

 
11,544

Total
19,656

 
19,691