Net Loss Per Share Attributable to Common Stockholders (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Net Loss Per Common Share

The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company (in thousands, except share data and per share data):

 

 

 

Years Ended December 31,

 

 

 

2015

 

 

2014

 

 

2013

 

Net loss attributable to common stockholders — basic and diluted

 

$

(39,594

)

 

$

(23,342

)

 

$

(17,143

)

Weighted-average number of common shares — basic and diluted

 

 

25,431,332

 

 

 

14,548,516

 

 

 

684,330

 

Net loss per share attributable to common stockholders — basic and diluted

 

$

(1.56

)

 

$

(1.60

)

 

$

(25.05

)

 
Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares Outstanding

The following potentially dilutive securities outstanding have been excluded from the computation of diluted weighted-average shares outstanding, because such securities had an antidilutive impact due to the losses reported (in common stock equivalent shares):

 

 

 

As of December 31,

 

 

 

2015

 

 

2014

 

 

2013

 

Options to purchase common stock

 

 

3,454,926

 

 

 

2,126,176

 

 

 

1,062,694

 

Warrants to purchase redeemable convertible preferred stock

 

 

—

 

 

 

—

 

 

 

128,663

 

Warrants to purchase common stock

 

 

300,564

 

 

 

128,663

 

 

 

—

 

Redeemable convertible preferred stock

 

 

—

 

 

 

—

 

 

 

6,826,004

 

Convertible notes payable

 

 

—

 

 

 

—

 

 

 

754,785