Quarterly report pursuant to Section 13 or 15(d)

CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY

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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Total
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       21,243 21,243
Net unrealized gain on short-term investments     55   55
Issuance of common stock upon exercise of options $ 1 1,335     1,336
Issuance of common stock upon exercise of options (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, 2020 $ 169 1,339,833 (4) (1,305,972) 34,026
Balance (in shares) at Dec. 31, 2020 169,316,782        
Increase (Decrease) in Stockholders' Equity          
Net income       39,500 39,500
Net unrealized gain on short-term investments     3   3
Issuance of common stock upon exercise of options $ 1 2,096     2,097
Issuance of common stock upon exercise of options (in shares) 813,854        
Stock compensation expense   2,672     2,672
Balance at Mar. 31, 2021 $ 170 $ 1,344,601 $ (1) $ (1,266,472) $ 78,298
Balance (in shares) at Mar. 31, 2021 170,130,636