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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash Flows from Operating Activities |  |
Net loss | $ (43,481) | $ (31,365)
Adjustments to reconcile net loss to net cash and cash equivalents from operating activities: |  |
Depreciation and amortization | 7,974 | 4,906
Amortization of right-of-use assets | 417 | 372
Stock-based compensation expense | 5,914 | 5,145
Change in fair value of warrant liabilities | (202) | (2,325)
Accretion of discounts on other long-term liabilities | 24 |
Amortization of premiums and accretion of discounts on marketable securities | (4,540) | (5,518)
Change in operating assets and liabilities that provided (used) cash and cash equivalents: |  |
Contract receivables | (6,213) | (1,232)
Contract receivables from related parties | (4,581) | (2,151)
Prepaid expenses and other assets | (2,287) | (188)
Accounts payable and other accrued liabilities | 884 | (297)
Deferred revenue | 10,075 | (32)
Deferred revenue from related parties | (828) | (4,000)
Accrued compensation | (3,030) | 649
Operating lease liabilities | (305) | (268)
Net cash and cash equivalents used in operating activities | (40,179) | (36,304)
Cash Flows from Investing Activities |  |
Purchases of property, plant and equipment | (8,460) | (21,184)
Purchases of marketable securities and investments | (99,548) | (174,400)
Proceeds from sales of marketable securities and investments | 156,135 | 210,329
Cash paid for note receivable to an independent contractor | (3,046) |
Purchases of intangible assets | (270) | (259)
Net cash and cash equivalents provided by investing activities | 44,811 | 14,486
Cash Flows from Financing Activities |  |
Payments of debt |  | (7)
Proceeds from exercise of stock options | 197 | 184
Proceeds from issuance of shares of common stock under the ESPP | 238 | 214
Cash paid for withholding of employee taxes related to stock-based compensation | (479) | (111)
Repurchase of shares of common stock | (8,274) |
Payments on finance lease liabilities | (213) | (146)
Net cash and cash equivalents provided by (used in) financing activities | (8,531) | 134
Net decrease in cash and cash equivalents | (3,899) | (21,684)
Cash and cash equivalents at beginning of period | 34,537 | 50,123
Cash and cash equivalents at end of period | 30,638 | 28,439
Supplemental information |  |
Cash paid for interest | 91 | 26
Accrued capital expenditures | $ 744 | $ 3,591

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