Selected Quarterly Financial Data (Unaudited)
12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (Unaudited)

13. Selected Quarterly Financial Data (Unaudited)

 

    Three Months Ended  
    Dec. 31,
2015
    Sept. 30,
2015
    June 30,
2015
    March 31,
2015
    Dec. 31,
2014
    Sept. 30,
2014
    June 30,
2014
    March 31,
2014
 

Statements of Operations Data:

               

Revenue

  $ —        $ —        $ —        $ —        $ —        $ —        $ —        $ —     

Loss from operations

    (11,072     (11,907     (8,982     (13,300     (6,261     (6,424     (5,885     (4,892

Net loss

    (11,017     (11,853     (8,957     (13,260     (6,208     (6,390     (5,851     (4,847

Basic and diluted net loss per share

  $ (0.49   $ (0.53   $ (0.40   $ (0.59   $ (0.28   $ (2.71   $ (11.68   $ (9.79