Annual report pursuant to Section 13 and 15(d)

STATEMENTS OF STOCKHOLDERS' EQUITY

v3.3.1.900
STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock
Additional Paid In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Total
Balance at Dec. 31, 2012 $ 87 $ 1,049,174 $ 82 $ (760,247) $ 289,096
Balance (in shares) at Dec. 31, 2012 87,140,632        
Increase (Decrease) in Stockholders' Equity          
Net loss       (89,027) (89,027)
Net change in unrealized gain on short-term investments     (35)   (35)
Issuance of common stock upon exercise of options and participation in Purchase Plan $ 1 1,050     1,051
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 383,717        
Stock compensation expense   7,166     7,166
Balance at Dec. 31, 2013 $ 88 1,057,390 47 (849,274) 208,251
Balance (in shares) at Dec. 31, 2013 87,524,349        
Increase (Decrease) in Stockholders' Equity          
Net loss       (90,908) (90,908)
Net change in unrealized gain on short-term investments     (54)   (54)
Issuance of common stock upon exercise of options and participation in Purchase Plan   1,170     1,170
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 517,096        
Stock compensation expense   9,787     9,787
Balance at Dec. 31, 2014 $ 88 1,068,347 (7) (940,182) 128,246
Balance (in shares) at Dec. 31, 2014 88,041,445        
Increase (Decrease) in Stockholders' Equity          
Net loss       (51,464) (51,464)
Net change in unrealized gain on short-term investments     (37)   (37)
Issuance of common stock upon exercise of options and participation in Purchase Plan $ 1 1,760     1,761
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 790,832        
Issuance of common stock, net of offering costs $ 2 5,470     5,472
Issuance of common stock, net of offering costs (in shares) 1,722,312        
Stock compensation expense   7,403     7,403
Balance at Dec. 31, 2015 $ 91 $ 1,082,980 $ (44) $ (991,646) $ 91,381
Balance (in shares) at Dec. 31, 2015 90,554,589