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Net Loss per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Potentially Anti-Dilutive Securities

Potentially anti-dilutive securities include the following (in thousands):

 

 

 

Year Ended December 31,

 

 

 

2015

 

 

2014

 

 

2013

 

Outstanding stock options

 

 

2,130

 

 

 

2,429

 

 

 

1,657

 

Unvested restricted stock units

 

 

58

 

 

 

371

 

 

 

315

 

Warrants to purchase common stock

 

 

5,763

 

 

 

6,561

 

 

 

6,462

 

Convertible debt

 

 

5,499

 

 

 

4,803

 

 

 

651