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Consolidated Balance Sheet Detail | 9 Months Ended
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Sep. 30, 2019
Consolidated Balance Sheet Detail | 7. Consolidated Balance Sheet Detail Inventories, net Inventories, net consists of the following:
|  | As of |
|  | September 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (Amounts in thousands) |
Raw materials |  | $ | 29,197 |  |  | $ | 24,937 |
Work-in-process |  |  | 5,438 |  |  |  | 5,185 |
Finished products |  |  | 16,944 |  |  |  | 12,141 |
Total inventories, net |  | $ | 51,579 |  |  | $ | 42,263 |
Property, Plant and Equipment Property, plant and equipment consist of the following:
|  | As of |
|  | September 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (Amounts in thousands) |
Land |  | $ | 1,023 |  |  | $ | 1,023 |
Buildings |  |  | 764 |  |  |  | 764 |
Leasehold improvements |  |  | 22,953 |  |  |  | 16,259 |
Equipment |  |  | 31,144 |  |  |  | 24,092 |
Furniture and fixtures |  |  | 14,214 |  |  |  | 5,448 |
Construction in progress (1) |  |  | 5,721 |  |  |  | 12,906 |
Other |  |  | 50 |  |  |  | — |
Total property, plant and equipment |  |  | 75,869 |  |  |  | 60,492 |
Less—Accumulated depreciation |  |  | (32,835 | ) |  |  | (28,312 | )
Total property, plant and equipment, net |  | $ | 43,034 |  |  | $ | 32,180 |
(1) | Construction in progress as of September 30, 2019 , includes $4.9 million , which is primarily related to various manufacturing expansion projects at our Waltham , Massachusetts and Rancho Dominguez, California facilities. Construction in progress as of December 31, 2018 includes $ 2.1 million of capitalized internal-use software development costs and $ 7.3 million for the buildout of our Marlborough , Massachusetts facility. Both projects have since been placed into service and as a result , $6.5 million of internal-use software development costs are now included in furniture and fixtures as of September 30, 2019 .
Depreciation expenses totaled $1.8 million and $1.3 million for the three months ended September 30, 2019 and 2018, respectively. Depreciation expenses totaled $5.2 million and $3.9 million for the nine months ended September 30, 2019 and 2018, respectively. Accrued Liabilities Accrued liabilities consist of the following:
|  | As of |
|  | September 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
|  | (Amounts in thousands) |
Employee compensation |  | $ | 14,451 |  |  | $ | 9,953 |
Taxes |  |  | 3,071 |  |  |  | 1,024 |
Royalty and license fees |  |  | 707 |  |  |  | 242 |
Warranties |  |  | 1,255 |  |  |  | 546 |
Professional fees |  |  | 715 |  |  |  | 942 |
Deferred revenue |  |  | 4,286 |  |  |  | 1,290 |
Other |  |  | 1,285 |  |  |  | 1,868 |
Total accrued liabilities |  | $ | 25,770 |  |  | $ | 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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