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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 |

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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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