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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities    
Net income (loss) $ 2,665 $ (20,901)
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,259 2,113
Amortization of right-of-use assets 1,668 1,335
Inventory write-off 1,264 0
Sublease termination loss (Note 5) 4,765 0
Accretion of discounts on marketable securities (8,465) (7,263)
Stock-based compensation expense 26,532 20,596
Bad debt expense 0 12,313
Non-cash interest expense 574 556
Changes in operating assets and liabilities:    
Accounts and other receivables, net (18,097) 42,448
Inventories (10,436) 6,358
Prepaid expenses and other current assets (6,290) (3,172)
Other assets (101) 703
Accounts payable (569) (151)
Lease liabilities (2,109) (1,679)
Accrued and other liabilities 374 2,412
Net cash (used in) provided by operating activities (5,966) 55,668
Investing activities    
Purchases of marketable securities (326,121) (259,531)
Proceeds from maturities and redemption of marketable securities 301,713 233,953
Purchases of property and equipment, net (1,528) (2,034)
Net cash used in investing activities (25,936) (27,612)
Financing activities    
Proceeds from exercise of stock options 2,054 1,617
Proceeds from Employee Stock Purchase Plan 904 777
Payments for taxes related to net share settlement of restricted stock units (8,576) (5,778)
Net cash used in financing activities (5,618) (3,384)
Effect of exchange rate changes on cash and cash equivalents, and restricted cash (265) 150
Net (decrease) increase in cash and cash equivalents, and restricted cash (37,785) 24,822
Cash and cash equivalents, and restricted cash at beginning of period 150,556 202,211
Cash and cash equivalents, and restricted cash at end of period 112,771 227,033
Supplemental disclosure of cash flow information    
Cash paid during the period for income taxes 2,963 710
Cash paid during the period for interest 2,819 2,819
Reclassification of contract asset from other current assets to other assets 0 71,307
Reclassification of CEPI accrual to CEPI accrual long-term 0 (60,337)
Advance Payments forgiven per CEPI-Bio E Assignment Agreement (Note 6) 0 (47,401)
Non-cash investing and financing activities:    
Purchases of property and equipment, not yet paid 574 540
Right-of-use assets obtained in exchange of operating lease liabilities $ 0 $ 901