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Consolidated Balance Sheet Detail | 12 Months Ended
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Dec. 31, 2021
Consolidated Balance Sheet Detail | 9. Consolidated Balance Sheet Detail Inventories, net Inventories, net consists of the following:
|  | December 31, |
|  | 2021 |  |  | 2020 |
|  | (Amounts in thousands) |
Raw materials |  | $ | 123,321 |  |  | $ | 48,746 |
Work-in-process |  |  | 8,119 |  |  |  | 8,084 |
Finished products |  |  | 53,054 |  |  |  | 38,195 |
Total inventories, net |  | $ | 184,494 |  |  | $ | 95,025 |
Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist of the following:
|  | December 31, |
|  | 2021 |  |  | 2020 |
|  | (Amounts in thousands) |
Equipment maintenance and services |  | $ | 10,857 |  |  | $ | 4,601 |
Prepaid income taxes |  |  | 3,970 |  |  |  | 2,649 |
Prepaid insurance |  |  | 2,713 |  |  |  | 1,936 |
Other |  |  | 8,409 |  |  |  | 9,490 |
Total prepaid expenses and other current assets |  | $ | 25,949 |  |  | $ | 18,676 |
Property, Plant and Equipment Property, plant and equipment consist of the following:
|  | December 31, |
|  | 2021 |  |  | 2020 |
|  | (Amounts in thousands) |
Land |  | $ | 1,023 |  |  | $ | 1,023 |
Buildings |  |  | 764 |  |  |  | 764 |
Leasehold improvements |  |  | 52,505 |  |  |  | 31,574 |
Equipment |  |  | 70,983 |  |  |  | 43,072 |
Furniture, fixtures and office equipment |  |  | 9,137 |  |  |  | 8,714 |
Computer hardware and software |  |  | 22,380 |  |  |  | 15,397 |
Construction in progress |  |  | 38,446 |  |  |  | 14,927 |
Other |  |  | 443 |  |  |  | 455 |
Total property, plant and equipment |  |  | 195,681 |  |  |  | 115,926 |
Less - Accumulated depreciation |  |  | (70,717 | ) |  |  | (49,056 | )
Total property, plant and equipment, net |  | $ | 124,964 |  |  | $ | 66,870 |
Depreciation expense totaled $16.4 million, $10.9 million and $7.3 million in the fiscal years ended December 31, 2021, 2020 and 2019, respectively. Accrued Liabilities Accrued liabilities consist of the following:
|  | December 31, |
|  | 2021 |  |  | 2020 |
|  | (Amounts in thousands) |
Employee compensation |  | $ | 42,147 |  |  | $ | 20,288 |
Income taxes payable |  |  | 4,984 |  |  |  | 1,423 |
Royalty and license fees |  |  | 1,461 |  |  |  | 466 |
Warranties |  |  | 1,722 |  |  |  | 1,576 |
Professional fees |  |  | 1,274 |  |  |  | 1,425 |
Deferred revenue |  |  | 14,848 |  |  |  | 15,318 |
Other |  |  | 9,062 |  |  |  | 12,589 |
Total accrued liabilities |  | $ | 75,498 |  |  | $ | 53,085 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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