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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities    
Net income (loss) $ 16,555 $ (43,021)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Stock-based compensation 14,750 14,705
Amortization of premiums and accretion of discounts on investment securities (1,786) (2,267)
Amortization of intangible assets 5,286 0
Gain on strategic investment 0 (4,845)
Loss on sale of investment securities 0 505
Depreciation 242 426
Changes in operating assets and liabilities:    
Accounts receivable, net 3,566 (3,720)
Interest and other receivables (1,295) (3,450)
Inventory (16,648) 481
Prepaid expenses (3,670) (2,234)
Operating lease right-of-use assets 1,759 1,726
Accounts payable 1,789 4,676
Accrued liabilities 12,193 24,510
Operating lease liabilities 212 (1,656)
Long-term liabilities (3,874) (3,769)
Net cash provided by (used in) operating activities 29,079 (17,933)
Cash flows from investing activities    
Purchases of investment securities (80,154) (66,892)
Sale and maturity of investment securities 66,115 259,410
Net cash (used in) provided by investing activities (14,039) 192,518
Cash flows from financing activities    
Proceeds from issuance of common stock, net of issuance costs 1,043 1,466
Net cash provided by financing activities 1,043 1,466
Effect of exchange rate changes on cash 5 (2)
Net increase in cash, cash equivalents and restricted cash 16,088 176,049
Cash, cash equivalents and restricted cash    
Beginning of period 194,427 120,616
End of period 210,515 296,665
Supplemental disclosure of noncash information:    
Accrued inventory purchases 9,354 0
Accrued milestone and contingent payments in connection with asset acquisition $ 50,000 $ 69,583