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Assets Manufactured for Internal Use, net - Components (Details) - Assets Manufactured for Internal Use - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Assets manufactured for internal use |  |  |
Useful life | 10 years |  |
Total cost | $ 60,768 | $ 62,618 |
Accumulated depreciation | (28,764) | (24,155) |
Assets manufactured for internal use, net | 32,004 | 38,463 |
Depreciation expense | 5,300 | 5,200 | $ 3,900
Internal use assets |  |  |
Assets manufactured for internal use |  |  |
Total cost | 60,596 | 62,462 |
Construction in process |  |  |
Assets manufactured for internal use |  |  |
Total cost | $ 172 | $ 156 |

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- Definition Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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