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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Shares
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Total
Balance at the beginning of the period at Dec. 31, 2020 $ 18 $ 829,424 $ (34) $ (517,473) $ 311,935
Balance at the beginning of the period (in shares) at Dec. 31, 2020 68,215,022        
Changes in equity          
Issuance of Class A common shares under incentive award plans   1,106     1,106
Issuance of Class A common shares under incentive award plans (in shares) 115,012        
Share-based compensation expense   7,126     7,126
Unrealized gain on short-term investments and currency translation adjustments     13   13
Net income (loss)       (49,484) (49,484)
Balance at the end of the period at Mar. 31, 2021 $ 18 837,656 (21) (566,957) 270,696
Balance at the end of the period (in shares) at Mar. 31, 2021 68,330,034        
Balance at the beginning of the period at Dec. 31, 2020 $ 18 829,424 (34) (517,473) 311,935
Balance at the beginning of the period (in shares) at Dec. 31, 2020 68,215,022        
Changes in equity          
Unrealized gain on short-term investments and currency translation adjustments         (11)
Net income (loss)         (121,591)
Balance at the end of the period at Sep. 30, 2021 $ 18 853,139 (45) (639,064) 214,048
Balance at the end of the period (in shares) at Sep. 30, 2021 68,888,435        
Balance at the beginning of the period at Mar. 31, 2021 $ 18 837,656 (21) (566,957) 270,696
Balance at the beginning of the period (in shares) at Mar. 31, 2021 68,330,034        
Changes in equity          
Issuance of Class A common shares under incentive award plans   887     887
Issuance of Class A common shares under incentive award plans (in shares) 134,715        
Share-based compensation expense   5,717     5,717
Unrealized gain on short-term investments and currency translation adjustments     48   48
Net income (loss)       (41,563) (41,563)
Balance at the end of the period at Jun. 30, 2021 $ 18 844,260 27 (608,520) 235,785
Balance at the end of the period (in shares) at Jun. 30, 2021 68,464,749        
Changes in equity          
Issuance of Class A common shares under incentive award plans   2,680     2,680
Issuance of Class A common shares under incentive award plans (in shares) 423,686        
Share-based compensation expense   6,199     6,199
Unrealized gain on short-term investments and currency translation adjustments     (72)   (72)
Net income (loss)       (30,544) (30,544)
Balance at the end of the period at Sep. 30, 2021 $ 18 853,139 (45) (639,064) 214,048
Balance at the end of the period (in shares) at Sep. 30, 2021 68,888,435        
Balance at the beginning of the period at Dec. 31, 2021 $ 18 860,482 (66) (675,397) 185,037
Balance at the beginning of the period (in shares) at Dec. 31, 2021 69,060,403        
Changes in equity          
Issuance of Class A common shares under incentive award plans $ 1 422     423
Issuance of Class A common shares under incentive award plans (in shares) 210,720        
Share-based compensation expense   6,031     6,031
Unrealized gain on short-term investments and currency translation adjustments     (37)   (37)
Net income (loss)       (25,210) (25,210)
Balance at the end of the period at Mar. 31, 2022 $ 19 866,935 (103) (700,607) 166,244
Balance at the end of the period (in shares) at Mar. 31, 2022 69,271,123        
Balance at the beginning of the period at Dec. 31, 2021 $ 18 860,482 (66) (675,397) 185,037
Balance at the beginning of the period (in shares) at Dec. 31, 2021 69,060,403        
Changes in equity          
Unrealized gain on short-term investments and currency translation adjustments         (4)
Net income (loss)         178,902
Balance at the end of the period at Sep. 30, 2022 $ 19 880,554 (70) (496,495) 384,008
Balance at the end of the period (in shares) at Sep. 30, 2022 69,524,338        
Balance at the beginning of the period at Mar. 31, 2022 $ 19 866,935 (103) (700,607) 166,244
Balance at the beginning of the period (in shares) at Mar. 31, 2022 69,271,123        
Changes in equity          
Issuance of Class A common shares under incentive award plans   542     542
Issuance of Class A common shares under incentive award plans (in shares) 155,644        
Share-based compensation expense   6,676     6,676
Unrealized gain on short-term investments and currency translation adjustments     13   13
Net income (loss)       (19,981) (19,981)
Balance at the end of the period at Jun. 30, 2022 $ 19 874,153 (90) (720,588) 153,494
Balance at the end of the period (in shares) at Jun. 30, 2022 69,426,767        
Changes in equity          
Issuance of Class A common shares under incentive award plans   360     360
Issuance of Class A common shares under incentive award plans (in shares) 97,571        
Share-based compensation expense   6,041     6,041
Unrealized gain on short-term investments and currency translation adjustments     20   20
Net income (loss)       224,093 224,093
Balance at the end of the period at Sep. 30, 2022 $ 19 $ 880,554 $ (70) $ (496,495) $ 384,008
Balance at the end of the period (in shares) at Sep. 30, 2022 69,524,338