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Intangible Assets, net | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, net | Intangible Assets, net The following table reflects the changes in the net carrying amounts of the Company’s intangible assets for the year ended December 31, 2020.
|  | Balance at December 31, 2019 |  | Assets Acquired Pursuant to Business Combination |  | Impairment Charges |  | Amortization Expense |  | Balance at December 31, 2020
Developed technology |  | $ | 9,046 |  |  | $ | — |  |  | $ | — |  |  | $ | 793 |  |  | $ | 8,253 |
|  | $ | 9,046 |  |  | $ | — |  |  | $ | — |  |  | $ | 793 |  |  | $ | 8,253 |
The following table reflects the changes in the net carrying amounts of the Company’s finite-lived intangible assets for the year ended December 31, 2019.
|  | Balance at December 31, 2018 |  | Assets Acquired Pursuant to Business Combination |  | Impairment Charges |  | Amortization Expense |  | Balance at December 31, 2019
Developed technology |  | $ | 17,956 |  |  | $ | — |  |  | $ | 7,628 |  |  | $ | 1,282 |  |  | $ | 9,046 |
Customer relationships |  | 112 |  |  | — |  |  | — |  |  | 112 |  |  | — |
|  | $ | 18,068 |  |  | $ | — |  |  | $ | 7,628 |  |  | $ | 1,394 |  |  | $ | 9,046 |
The following table reflects the carrying amounts of the Company's finite-lived intangible assets at December 31, 2020 and 2019.
|  | December 31, 2020 |  | December 31, 2019
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Developed technology |  | $ | 10,300 |  |  | $ | (2,047) |  |  | $ | 10,300 |  |  | (1,254) |
Customer relationships |  | — |  |  | — |  |  | 270 |  |  | (270) |
|  | $ | 10,300 |  |  | $ | (2,047) |  |  | $ | 10,570 |  |  | $ | (1,524) |
The Company uses the straight-line method to determine the amortization expense for its definite-lived intangible assets. The weighted-average remaining useful life for the intangible assets is 10.4 years. Amortization expense related to the purchased intangible assets was $793, $1,394 and $1,002 for the year ended December 31, 2020, 2019, and 2018, respectively. The Company recorded an impairment charge of $7,628 related to specific developed technology allocated to the Quickload during the third quarter of 2019. Amortizable intangible assets are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable through the estimated undiscounted future cash flows derived from such assets. The Company has developed and tested a new transload technology and no longer plans to actively market the Quickload and as such, all developed technology intangible assets related to the Quickload has been impaired. The Company conducted a review of its indefinite-lived intangible assets as of December 31, 2018 and determined the carrying value exceeded its fair value, which resulted in a full impairment of indefinite-lived intangible assets in 2018. The table below reflects the future estimated amortization expense for amortizable intangible assets as of December 31, 2020.
Year ending December 31, |  |
2021 |  | $ | 792 |
2022 |  | 792 |
2023 |  | 792 |
2024 |  | 792 |
2025 |  | 792 |
Thereafter |  | 4,293 |
Total |  | $ | 8,253 |

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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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