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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities    
Net income (loss) $ 357,912 $ (70,550)
Adjustments to reconcile net income / (loss) to net cash generated from / used in operating activities:    
Depreciation and amortization 3,667 3,505
Share-based compensation expense 12,792 10,078
Change in fair value of derivative financial instruments   (2,206)
Unrealized foreign exchange gains, net (12,279) (908)
Other non-cash items, net 539 (1,600)
Changes in operating assets and liabilities:    
Accounts receivable, prepaid expenses, and other current assets and receivables (3,355) 1,050
Accounts payable 10,444 (981)
Accrued expenses, other liabilities, and operating leases 5,486 (1,332)
Net cash generated from / (used) in operating activities 375,206 (62,944)
Cash flows from investing activities    
Purchases of intangible assets   (2,214)
Purchases of property, plant and equipment (6,191) (2,392)
Net cash used in investing activities (6,191) (4,606)
Cash flows from financing activities    
Proceeds from loan increment, net of debt issuance costs 34,603  
Proceeds from issuance of ordinary shares 30,899  
Share issuance costs from issuance of ordinary shares (1,334)  
Proceeds from issuance of ordinary shares related to employee stock option and purchase plans 960 3,549
Net cash generated from financing activities 65,128 3,549
Currency effect on cash, cash equivalents and restricted cash (1,665) 223
Net increase / (decrease) in cash, cash equivalents and restricted cash 432,478 (63,778)
Cash, cash equivalents and restricted cash at beginning of period 247,680 380,726
Cash, cash equivalents and restricted cash at the end of period 680,158 316,948
Cash and cash equivalents 677,330 314,265
Restricted cash related to leasehold and other deposits 2,828 2,683
Total cash, cash equivalents and restricted cash 680,158 316,948
Supplemental cash flow disclosures:    
Cash paid for interest (2,943) (2,545)
Non-cash increase in accounts payables and accrued expenses and other current liabilities related to purchases of intangible assets and property, plant, and equipment $ 3,488 $ 1,021