Quarterly report pursuant to Section 13 or 15(d)

CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY

v3.20.2
CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Total
Balance at Dec. 31, 2018 $ 167 $ 1,319,068 $ (24) $ (1,209,334) $ 109,877
Balance (in shares) at Dec. 31, 2018 167,171,505        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (17,598) (17,598)
Net unrealized (loss) gain on short-term investments     34   34
Issuance of common stock upon exercise of options and participation in Purchase Plan   16     16
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 7,583        
Stock compensation expense   2,986     2,986
Balance at Mar. 31, 2019 $ 167 1,322,070 10 (1,226,932) 95,315
Balance (in shares) at Mar. 31, 2019 167,179,088        
Balance at Dec. 31, 2018 $ 167 1,319,068 (24) (1,209,334) 109,877
Balance (in shares) at Dec. 31, 2018 167,171,505        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)         (49,694)
Net unrealized (loss) gain on short-term investments         60
Balance at Sep. 30, 2019 $ 168 1,327,735 36 (1,259,028) 68,911
Balance (in shares) at Sep. 30, 2019 167,609,044        
Balance at Mar. 31, 2019 $ 167 1,322,070 10 (1,226,932) 95,315
Balance (in shares) at Mar. 31, 2019 167,179,088        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (20,606) (20,606)
Net unrealized (loss) gain on short-term investments     33   33
Issuance of common stock upon exercise of options and participation in Purchase Plan $ 1 855     856
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 425,331        
Stock compensation expense   2,693     2,693
Balance at Jun. 30, 2019 $ 168 1,325,618 43 (1,247,538) 78,291
Balance (in shares) at Jun. 30, 2019 167,604,419        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (11,490) (11,490)
Net unrealized (loss) gain on short-term investments     (7)   (7)
Issuance of common stock upon exercise of options and participation in Purchase Plan   9     9
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 4,625        
Stock compensation expense   2,108     2,108
Balance at Sep. 30, 2019 $ 168 1,327,735 36 (1,259,028) 68,911
Balance (in shares) at Sep. 30, 2019 167,609,044        
Balance at Dec. 31, 2019 $ 168 1,329,852 23 (1,276,228) 53,815
Balance (in shares) at Dec. 31, 2019 167,987,850        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       21,243 21,243
Net unrealized (loss) gain on short-term investments     55   55
Issuance of common stock upon exercise of options and participation in Purchase Plan $ 1 1,335     1,336
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 581,675        
Stock compensation expense   2,050     2,050
Balance at Mar. 31, 2020 $ 169 1,333,237 78 (1,254,985) 78,499
Balance (in shares) at Mar. 31, 2020 168,569,525        
Balance at Dec. 31, 2019 $ 168 1,329,852 23 (1,276,228) 53,815
Balance (in shares) at Dec. 31, 2019 167,987,850        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)         (10,507)
Net unrealized (loss) gain on short-term investments         (21)
Balance at Sep. 30, 2020 $ 169 1,337,519 2 (1,286,735) 50,955
Balance (in shares) at Sep. 30, 2020 168,943,434        
Balance at Mar. 31, 2020 $ 169 1,333,237 78 (1,254,985) 78,499
Balance (in shares) at Mar. 31, 2020 168,569,525        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (17,576) (17,576)
Net unrealized (loss) gain on short-term investments     (32)   (32)
Issuance of common stock upon exercise of options and participation in Purchase Plan   541     541
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 348,098        
Stock compensation expense   1,778     1,778
Balance at Jun. 30, 2020 $ 169 1,335,556 46 (1,272,561) 63,210
Balance (in shares) at Jun. 30, 2020 168,917,623        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (14,174) (14,174)
Net unrealized (loss) gain on short-term investments     (44)   (44)
Issuance of common stock upon exercise of options and participation in Purchase Plan   52     52
Issuance of common stock upon exercise of options and participation in Purchase Plan (in shares) 25,811        
Stock compensation expense   1,911     1,911
Balance at Sep. 30, 2020 $ 169 $ 1,337,519 $ 2 $ (1,286,735) $ 50,955
Balance (in shares) at Sep. 30, 2020 168,943,434