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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net Loss $ (441,048,000) $ (259,343,000) $ (8,888,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 90,985,000 112,949,000 67,553,000
Asset impairment 0 0 17,433,000
Goodwill impairment 292,583,000 37,874,000 0
Amortization of debt issuance cost 3,950,000 862,000 288,000
(Accretion) amortization on available-for-sale investments, net   (22,000) 19,000
(Gain) loss on investments (5,030,000) (2,900,000) 9,826,000
Net loss on disposal of property, plant and equipment 1,371,000 458,000 152,000
Stock-based compensation expense 15,342,000 16,016,000 28,322,000
Deferred income taxes 2,247,000 15,558,000 (62,388,000)
Inventory write down - business efficiency program 4,135,000 24,313,000  
Inventory reserves 3,980,000 25,546,000 (2,363,000)
Other, net   (2,942,000)  
Change in operating assets and liabilities:      
Accounts receivable, net 46,108,000 65,612,000 788,000
Other receivables 10,713,000 10,315,000 (20,088,000)
Income taxes receivable 648,000 (2,637,000)  
Inventory 75,171,000 20,537,000 (73,237,000)
Prepaid expenses, other current assets and other assets (10,718,000) (29,883,000) (7,116,000)
Accounts payable 11,784,000 (91,907,000) 28,105,000
Accrued expenses and other liabilities 5,519,000 17,929,000 (20,483,000)
Income taxes payable (4,670,000) (3,939,000) (2,151,000)
Net cash provided by (used in) operating activities 103,070,000 (45,604,000) (44,228,000)
Cash flows from investing activities:      
Purchases of property, plant and equipment (32,454,000) (33,683,000) (17,072,000)
Purchases of intangibles - developed technology (30,671,000) (9,438,000)  
Proceeds from sales and maturities of available-for-sale investments 1,240,000 10,567,000 51,661,000
Purchases of available-for-sale investments (268,000) (868,000) (23,899,000)
(Payments) for and proceeds from beneficial interests in securitized accounts receivable (55,000) 1,218,000 1,126,000
Proceeds from disposals of property, plant and equipment     12,000
Acquisition of business, net of cash acquired     44,003,000
Net cash (used in) provided by investing activities (62,208,000) (32,204,000) 55,831,000
Cash flows from financing activities:      
Tax withholdings related to stock-based compensation settlements (1,143,000) (6,458,000) (4,253,000)
Proceeds from stock option exercises 824,000 540,000 6,904,000
Dividend payments 0 (21,237,000) (22,885,000)
Proceeds from receivables purchase agreement 68,556,000 14,099,000  
Repayments on receivables purchase agreement (83,772,000)    
Proceeds from draw on revolving credit agreements 26,000,000 163,733,000 141,887,000
Repayment of revolving credit agreements (31,000,000) (64,987,000) (48,000,000)
Redemption of redeemable non-controlling interest (17,398,000) (1,224,000)  
Payment of annual recurring compensation to non-controlling interest (10,084,000)    
Payment of debt issuance cost (1,994,000) (708,000) (3,015,000)
Repayment of notes payable   (24,891,000) (17,702,000)
Net cash (used in) provided by financing activities (50,011,000) 58,867,000 52,936,000
Net (decrease) increase in cash and cash equivalents (9,149,000) (18,941,000) 64,539,000
Effect of exchange rate changes (451,000) (2,536,000) (12,713,000)
Cash, cash equivalents and restricted cash, beginning of year 87,167,000 108,644,000 56,818,000
Cash, cash equivalents and restricted cash, end of year 77,567,000 87,167,000 108,644,000
Supplemental disclosure of cash flow information:      
Cash paid for interest 20,884,000 12,596,000 1,728,000
Cash paid for income taxes, net of refunds 6,691,000 18,552,000 3,832,000
Cash used in operating activities related to operating leases 9,274,000 9,682,000 5,229,000
Supplemental disclosure of non-cash investing activities      
Right-of-use assets obtained in exchange for operating lease obligations 5,317,000 17,865,000 3,410,000
Purchases of property, plant and equipment included in accounts payable 2,635,000 1,298,000 1,165,000
Redemption of redeemable non-controlling interest $ 2,986,000 $ 371,000  
Adtran Networks common shares exchanged in acquisition     565,491,000
Adtran Networks options assumed in acquisition     12,769,000
Non-controlling interest related to Adtran Networks     $ 316,415,000