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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2022
Accounting Policies [Abstract] |
Schedule of Inventories | Inventories consisted of the following:
| December 31,
Dollars in thousands | 2022 |  | 2021
Finished goods | 172,088 |  |  | $ | 162,528 |
Work in process | 70,598 |  |  | 65,323 |
Raw materials | 81,897 |  |  | 89,535 |
Total inventories, net | $ | 324,583 |  |  | $ | 317,386 |
Schedule of Property, Plant and Equipment Balances and Corresponding Lives | Property, plant and equipment balances and corresponding lives were as follows:
| December 31, |  |
Dollars in thousands | 2022 |  | 2021 |  | Useful Lives
Land | $ | 966 |  |  | $ | 1,512 |  |  |
Buildings and building improvements | 14,710 |  |  | 19,032 |  |  | 5-40 years
Leasehold improvements | 164,292 |  |  | 155,495 |  |  | 1-20 years
Machinery and production equipment | 181,780 |  |  | 183,270 |  |  | 3-20 years
Demonstration equipment | 3,792 |  |  | 2,791 |  |  | 4-5 years
Information systems and hardware | 151,330 |  |  | 148,706 |  |  | 1-7 years
Furniture, fixtures, and office equipment | 20,286 |  |  | 20,921 |  |  | 1-15 years
Construction-in-progress | 103,875 |  |  | 94,850 |  |  |
Total | 641,031 |  |  | 626,577 |  |  |
Less: Accumulated depreciation | (329,729) |  |  | (314,874) |  |  |
Property, plant and equipment, net | $ | 311,302 |  |  | $ | 311,703 |  |  |
Schedule of Impact on Statement of Operations | The Company adopted this guidance on January 1, 2021 using the modified retrospective approach which resulted in a cumulative-effect adjustment that increased (decreased) the following consolidated balance sheet accounts:
ADJUSTMENT |  | CONSOLIDATED BALANCE SHEET CLASSIFICATION |  | AMOUNT (in millions)
Deferred tax impact of cumulative-effect adjustment |  | Deferred tax liabilities |  | $ | (20.6) |
Debt discount reclassification |  | Long-term convertible securities |  | 89.1 |
Equity issuance costs reclassification |  | Long-term convertible securities |  | (2.5) |
Debt discount amortization and equity costs reclassification, net of tax |  | Retained Earnings |  | (2.8) |
Net impact of cumulative-effect adjustment |  | Additional paid-in capital |  | (63.3) |
Summary of Valuation Allowance | The valuation allowance at December 31, 2022 and 2021 primarily remained unchanged from respective prior periods; decreasing by an immaterial amount in both periods.
| Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Other |  | Deductions |  | Balance at End of Period
Description |  |  |  |
Dollars in thousands |  |  |
Year ended December 31, 2022 |  |  |  |  |  |  |  |  |
Deferred tax assets valuation allowance | 15,258 |  |  | (515) |  |  |  |  | (71) |  |  | 14,672 |
Year ended December 31, 2021 |  |  |  |  |  |  |  |  |
Deferred tax assets valuation allowance | 13,825 |  |  | 1,444 |  |  | 89 |  |  | (100) |  |  | 15,258 |
Year ended December 31, 2020 |  |  |  |  |  |  |  |  |
Deferred tax assets valuation allowance | 12,069 |  |  | 1,617 |  |  | — |  |  | 139 |  |  | 13,825 |
Restructuring and Related Costs | The following table summarizes our restructuring related accrual balances included within accrued expenses and other current liabilities in the consolidated balance sheet for the year ended December 31, 2022 and 2021.
|  | Years Ended December 31,
(Dollars in thousands) |  | 2022 |  | 2021
Balance, beginning of the year |  | $ | 10,226 |  |  | $ | 6,372 |
Charges: |  |  |  |
Cost of Goods Sold |  | $ | 1,494 |  |  | $ | 3,436 |
Research and development |  | 72 |  | 288
Selling, general and administrative |  | $ | 5,582 |  |  | $ | 466 |
Payments and other adjustments |  | $ | (12,267) |  |  | $ | (336) |
Balance, end of the year |  | $ | 5,107 |  |  | $ | 10,226 |
Accounts Receivable, Allowance for Credit Loss | The below table shows the rollforward of the allowance for doubtful accounts for the years ended December 31, 2022, 2021 and 2020:
| Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Other |  | Deductions |  | Balance at End of Period
Dollars in thousands |  |  |  |
Year Ended: |  |  |  |  |  |  |  |  |
December 31, 2022 | $ | 4,735 |  |  | 238 |  |  | — |  |  | (669) |  |  | $ | 4,304 |
December 31, 2021 | $ | 6,439 |  |  | (1,059) |  |  | 341 |  |  | (986) |  |  | $ | 4,735 |
December 31, 2020 | $ | 4,303 |  |  | 3,635 |  |  | — |  |  | (1,499) |  |  | $ | 6,439 |
(1)Deductions primarily relates to allowance for doubtful accounts written off during the year, net of recoveries and other adjustments.

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