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Net Loss Per Share Attributable to Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Weighted-Average Equity Instruments Excluded from Calculation of Diluted Net Loss Per Share

The following weighted-average equity instruments were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented:

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Series A convertible preferred stock

 

 

—

 

 

 

—

 

 

 

—

 

 

 

816,677

 

Series B convertible preferred stock

 

 

—

 

 

 

—

 

 

 

—

 

 

 

1,879,553

 

Unvested restricted common stock

 

 

52,882

 

 

 

95,415

 

 

 

63,364

 

 

 

105,996

 

Options to purchase common stock

 

 

2,294,012

 

 

 

1,361,135

 

 

 

1,846,593

 

 

 

1,017,620