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GOODWILL AND OTHER INTANGIBLE ASSETS | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | 10. GOODWILL AND OTHER INTANGIBLE ASSETS There were no changes in the carrying values of goodwill for the nine months ended September 30, 2019.
|  | Critical Power |  |  |  |
|  | Solutions |  |  | Total |
|  | Segment |  |  | Goodwill |
Gross Goodwill: |  |  |  |  |  |  |  |
Balance as of January 1, 2019 |  | $ | 2,969 |  |  | $ | 2,969 |
No activity |  |  | — |  |  |  | — |
Balance as of September 30, 2019 |  | $ | 2,969 |  |  | $ | 2,969 |
Changes in the carrying values of intangible assets for the nine months ended September 30, 2019, were as follows:
|  |  | Critical Power |  |  | Total |
|  |  | Solutions |  |  | Intangible |
|  |  | Segment |  |  | Assets |
Balance as of January 1, 2019, net |  |  | $ | 124 |  |  | $ | 124 |
Amortization |  |  |  | (31 | ) |  |  | (31 | )
Balance as of September 30, 2019, net |  |  | $ | 93 |  |  | $ | 93 |
The components of intangible assets as of September 30, 2019 are summarized below:
|  | Weighted Average Amortization Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |
Internally developed software |  |  | 7 |  |  | $ | 289 |  |  | $ | (196 | ) |  | $ | 93 |
Total intangible assets |  |  |  |  |  | $ | 289 |  |  | $ | (196 | ) |  | $ | 93 |
The amortization of intangible assets expense was $31 and $1.0 million for the nine months ended September 30, 2019 and 2018, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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