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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash Flows from Operating Activities:    
Net loss $ (94,690) $ (60,994)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 13,203 5,310
Stock-based compensation 7,874 13,270
Amortization of operating lease right-of-use assets 3,039 1,352
Loss on debt extinguishment 0 7,804
Amortization of debt issuance costs and other non-cash interest expense 1,993 2,300
Deferred taxes 984 89
Non-cash services acquired 6,687 10,619
Other 668 76
Change in operating assets and liabilities, net of acquisitions:    
Accounts receivable (13,004) 2,714
Prepaid expenses and other current assets (3,726) (2,666)
Contract assets (2,198) (2,521)
Inventories (5,791) 102
Other assets 6,128 (936)
Accounts payable 1,722 3,060
Contract liabilities (1,811) (12,559)
Accrued expenses (4,232) 3,812
Operating lease liabilities (770) (1,522)
Other liabilities (103) (213)
Net cash used in operating activities (84,027) (30,903)
Cash Flows from Investing Activities:    
Purchases of property and equipment (86,652) (57,865)
Grant funding for property and equipment 31,056 38,250
Acquisitions, net of cash acquired (5,837) (6,572)
Net cash used in investing activities (61,433) (26,187)
Cash Flows from Financing Activities:    
Repayment of term loan 0 (64,420)
Borrowings from the credit facility 0 64,500
Repayments on the credit facility 0 (64,500)
Proceeds from the exercise of stock options 8,533 155
Proceeds from the issuance of Common stock, net 0 45,886
Proceeds from the issuance of Class C preferred stock, net 0 116,047
Proceeds from the issuance of Class A common stock upon initial public offering, net of underwriting costs 0 409,405
Costs associated with initial public offering 0 (3,502)
Sale of noncontrolling interest 19,067 6,029
Purchase of noncontrolling interest 0 (7,001)
Redemptions of Class A-1 redeemable preferred stock 0 (3,044)
Cash repayment of Preferred B dividends 0 (27,584)
Costs associated with the credit facility 0 (2,146)
Proceeds from the 2024 convertible note 0 130
Net cash provided by financing activities 27,600 469,955
Effect of foreign exchange on cash and cash equivalents (33) 130
Net (decrease) increase in cash and cash equivalents (117,893) 412,995
Cash and cash equivalent at the beginning of the period 491,329 55,930
Cash and cash equivalents at the end of the period  $ 373,436 $ 468,925