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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Convertible Senior Notes Due 2022
Convertible Senior Notes Due 2022
Additional Paid-In Capital
Convertible Senior Notes Due 2025
Additional Paid-In Capital
Balances (in shares) at Dec. 31, 2019   41,908,000            
Balance at beginning of period at Dec. 31, 2019 $ 354,944 $ 42 $ 753,978 $ (399,398) $ 322      
Increase (Decrease) in Stockholders' Equity                
Exercise of stock options (in shares)   1,130,000            
Exercise of stock options 36,238 $ 1 36,237          
Vested restricted stock units (in shares)   238,000            
Shares issued under employee stock purchase plan (in shares)   37,000            
Shares issued under employee stock purchase plan 1,421   1,421          
Stock-based compensation 29,024   29,024          
Retirement of equity component of 2022 convertible senior notes (Note 8)             $ (33,089)  
Equity component of 2025 convertible senior notes issued, net of deferred taxes of $20,450 (Note 8)               $ 64,619
Other comprehensive loss (Note 11) 525       525      
Net income 131,008     131,008        
Balances (in shares) at Sep. 30, 2020   43,313,000            
Balance at end of period at Sep. 30, 2020 584,690 $ 43 852,190 (268,390) 847      
Balances (in shares) at Jun. 30, 2020   42,608,000            
Balance at beginning of period at Jun. 30, 2020 388,148 $ 43 785,124 (398,509) 1,490      
Increase (Decrease) in Stockholders' Equity                
Exercise of stock options (in shares)   703,000            
Exercise of stock options 24,582 $ 0 24,582          
Vested restricted stock units (in shares)   2,000            
Stock-based compensation 10,954   10,954          
Retirement of equity component of 2022 convertible senior notes (Note 8)           $ (33,089) $ (33,089)  
Equity component of 2025 convertible senior notes issued, net of deferred taxes of $20,450 (Note 8)               $ 64,619
Other comprehensive loss (Note 11) (643)       (643)      
Net income 130,119     130,119        
Balances (in shares) at Sep. 30, 2020   43,313,000            
Balance at end of period at Sep. 30, 2020 584,690 $ 43 852,190 (268,390) 847      
Balances (in shares) at Dec. 31, 2020   43,637,000            
Balance at beginning of period at Dec. 31, 2020 $ 619,688 $ 44 873,201 (253,875) 318      
Increase (Decrease) in Stockholders' Equity                
Exercise of stock options (in shares) 553,023 553,000            
Exercise of stock options $ 19,039 $ 1 19,038          
Vested restricted stock units (in shares)   302,000            
Shares issued under employee stock purchase plan (in shares) 31,230 31,000            
Shares issued under employee stock purchase plan $ 1,574   1,574          
Stock-based compensation 31,356   31,356          
Other comprehensive loss (Note 11) (165)       (165)      
Net income 47,110     47,110        
Balances (in shares) at Sep. 30, 2021   44,523,000            
Balance at end of period at Sep. 30, 2021 718,602 $ 45 925,169 (206,765) 153      
Balances (in shares) at Jun. 30, 2021   44,437,000            
Balance at beginning of period at Jun. 30, 2021 687,168 $ 44 911,368 (224,425) 181      
Increase (Decrease) in Stockholders' Equity                
Exercise of stock options (in shares)   74,000            
Exercise of stock options 3,018 $ 1 3,017          
Vested restricted stock units (in shares)   12,000            
Stock-based compensation 10,784   10,784          
Other comprehensive loss (Note 11) (28)       (28)      
Net income 17,660     17,660        
Balances (in shares) at Sep. 30, 2021   44,523,000            
Balance at end of period at Sep. 30, 2021 $ 718,602 $ 45 $ 925,169 $ (206,765) $ 153