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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:      
Net Loss $ (259,343,000) $ (8,888,000) $ (8,635,000)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:      
Depreciation and amortization 112,949,000 67,553,000 16,084,000
Asset impairments 0 17,433,000 0
Goodwill impairment 37,874,000 0 0
Amortization of debt issuance cost 862,000 288,000  
(Accretion) amortization on available-for-sale investments, net (22,000) 19,000 108,000
(Gain) loss on investments (2,900,000) 9,826,000 (5,127,000)
Net loss on disposal of property, plant and equipment 458,000 152,000 4,000
Stock-based compensation expense 16,016,000 28,322,000 7,480,000
Deferred income taxes 15,558,000 (62,388,000) (1,784,000)
Inventory write down 24,313,000    
Inventory reserves 25,546,000 (2,363,000) (5,029,000)
Other, net (2,942,000)    
Change in operating assets and liabilities:      
Accounts receivable, net 65,612,000 788,000 (60,864,000)
Other receivables 10,315,000 (20,088,000) 9,752,000
Income taxes receivable (2,637,000)    
Inventory 20,537,000 (73,237,000) (10,638,000)
Prepaid expenses, other current assets and other assets (29,883,000) (7,116,000) (7,146,000)
Accounts payable (91,907,000) 28,105,000 53,270,000
Accrued expenses and other liabilities 17,929,000 (20,483,000) 10,063,000
Income taxes payable (3,939,000) (2,151,000) 5,470,000
Net cash (used in) provided by operating activities (45,604,000) (44,228,000) 3,008,000
Cash flows from investing activities:      
Purchases of property, plant and equipment (43,121,000) (17,072,000) (5,669,000)
Proceeds from sales and maturities of available-for-sale investments 10,567,000 51,661,000 50,466,000
Purchases of available-for-sale investments (868,000) (23,899,000) (35,031,000)
Proceeds from beneficial interests in securitized accounts receivable 1,218,000 1,126,000  
Proceeds from disposals of property, plant and equipment   12,000  
Insurance proceeds received     500,000
Acquisition of business, net of cash acquired   44,003,000  
Net cash (used in) provided by investing activities (32,204,000) 55,831,000 10,266,000
Cash flows from financing activities:      
Tax withholdings related to stock-based compensation settlements (6,458,000) (4,253,000) (1,860,000)
Proceeds from stock option exercises 540,000 6,904,000 6,431,000
Dividend payments (21,237,000) (22,885,000) (17,529,000)
Proceeds from receivables purchase agreement 14,099,000    
Proceeds from draw on revolving credit agreements 163,733,000 141,887,000 10,000,000
Repayment of revolving credit agreements (64,987,000) (48,000,000) (10,000,000)
Redemption of redeemable non-controlling interest (1,224,000)    
Payment of debt issuance cost (708,000) (3,015,000)  
Repayment of notes payable (24,891,000) (17,702,000)  
Net cash provided by (used in) financing activities 58,867,000 52,936,000 (12,958,000)
Net (decrease) increase in cash and cash equivalents (18,941,000) 64,539,000 316,000
Effect of exchange rate changes (2,536,000) (12,713,000) (3,677,000)
Cash, cash equivalents and restricted cash, beginning of year 108,644,000 56,818,000 60,179,000
Cash, cash equivalents and restricted cash, end of year 87,167,000 108,644,000 56,818,000
Supplemental disclosure of cash financing activities      
Cash paid for interest 12,596,000 1,728,000 13,000
Cash paid for income taxes 18,552,000 3,832,000 1,780,000
Cash used in operating activities related to operating leases 9,682,000 5,229,000 1,892,000
Supplemental disclosure of non-cash investing activities      
Right-of-use assets obtained in exchange for operating lease obligations 17,865,000 3,410,000 1,875,000
Purchases of property, plant and equipment included in accounts payable $ 1,298,000 1,165,000 $ 638,000
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