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Consolidated Balance Sheet Detail | 12 Months Ended
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Dec. 31, 2019
Consolidated Balance Sheet Detail |
7. | Consolidated Balance Sheet Detail
Inventories, net Inventories, net consists of the following:
|  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (Amounts in thousands) |
Raw materials |  | $ | 29,328 |  |  | $ | 24,937 |
Work-in-process |  |  | 8,360 |  |  |  | 5,185 |
Finished products |  |  | 17,144 |  |  |  | 12,141 |
Total inventories, net |  | $ | 54,832 |  |  | $ | 42,263 |
Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist of the following:
|  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (Amounts in thousands) |
Equipment maintenance and services |  | $ | 1,662 |  |  | $ | 1,677 |
Prepaid taxes |  |  | 2,719 |  |  |  | 843 |
Prepaid insuran c e |  |  | 80 |  |  |  | 629 |
Deferred costs |  |  | — |  |  |  | 55 |
Other |  |  | 1,456 |  |  |  | 697 |
Total prepaid expenses and other current assets |  | $ | 5,917 |  |  | $ | 3,901 |
Property, Plant and Equipment Property, plant and equipment consist of the following:
|  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (Amounts in thousands) |
Land |  | $ | 1,023 |  |  | $ | 1,023 |
Buildings |  |  | 764 |  |  |  | 764 |
Leasehold improvements |  |  | 23,905 |  |  |  | 16,259 |
Equipment |  |  | 36,257 |  |  |  | 24,092 |
Furniture, fixtures and office equipment |  |  | 6,312 |  |  |  | 4,914 |
Computer hardware and software |  |  | 8,810 |  |  |  | 534 |
Construction in progress (1) |  |  | 6,707 |  |  |  | 12,906 |
Other |  |  | 56 |  |  |  | — |
Total property, plant and equipment |  |  | 83,834 |  |  |  | 60,492 |
Less - Accumulated depreciation |  |  | (35,379 | ) |  |  | (28,312 | )
Total property, plant and equipment, net |  | $ | 48,455 |  |  | $ | 32,180 |
(1) | Construction in progress as of December 31, 2019 primarily includes $4.2 million for the buildout of the Company’s Waltham and Marlborough, Massachusetts facilities, $1.1 million of other manufacturing improvements in Waltham and Marlboro, $0.6 million in manufacturing improvements at the Company’s Rancho Dominguez, California facility and $0.4 million for a buildout at the Company’s Bridgewater, New Jersey facility. Construction in progress as of December 31, 2018 includes $7.3 million for the buildout of the Company’s Marlborough facility, $2.1 million in capitalized internal-use software development costs and $2.1 million for a casting machine, among other projects.
Depreciation expense totaled $7.3 million, $5.2 million and $4.2 million in the fiscal years ended December 31, 2019, 2018 and 2017, respectively. Accrued Liabilities Accrued liabilities consist of the following:
|  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (Amounts in thousands) |
Employee compensation |  | $ | 19,850 |  |  | $ | 9,953 |
Taxes |  |  | 3,874 |  |  |  | 1,024 |
Royalty and license fees |  |  | 123 |  |  |  | 242 |
Warranties |  |  | 1,500 |  |  |  | 546 |
Professional fees |  |  | 1,081 |  |  |  | 942 |
Deferred revenue |  |  | 5,005 |  |  |  | 1,290 |
Other |  |  | 1,898 |  |  |  | 1,868 |
Total accrued liabilities |  | $ | 33,331 |  |  | $ | 15,865 |

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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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