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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The carrying amounts for goodwill and changes in the carrying value were as follows:
(in thousands) |  | For the Year Ended December 31,
|  |  |  |  |  | 2015 |  | 2014
|  | 2017 |  | 2016 |  | (Restated) |  | (Restated)
Balance at beginning of year, net |  | $ | 29,835 |  |  | $ | 29,835 |  |  | $ | 23,414 |  |  | $ | — |
Acquisitions |  | — |  |  | — |  |  | 18,054 |  |  | 23,414 |
Impairment losses |  | — |  |  | — |  |  | (11,633 | ) |  | — |
Balance at end of year, net |  | $ | 29,835 |  |  | $ | 29,835 |  |  | $ | 29,835 |  |  | $ | 23,414 |
Accumulated impairment losses |  | $ | (11,633 | ) |  | $ | (11,633 | ) |  | $ | — |  |  | $ | — |
Schedule of Finite-Lived Intangible Assets | Components of intangible assets are as follows:
(in thousands, except weighted-average useful life) |  |  | As of December 31, 2017
|  | Weighted-Average Useful Life (in years) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value
Customer relationships |  | 10.0 |  | $ | 34,940 |  |  | $ | (14,915 | ) |  | $ | 20,025 |
Developed technology |  | 4.2 |  | 1,000 |  |  | (434 | ) |  | 566 |
Trade names and trademarks |  | 6.1 |  | 1,700 |  |  | (800 | ) |  | 900 |
Total |  |  |  | $ | 37,640 |  |  | $ | (16,149 | ) |  | $ | 21,491 |
(in thousands, except weighted-average useful life) |  |  | As of December 31, 2016
|  | Weighted-Average Useful Life (in years) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value
Customer relationships |  | 10.8 |  | $ | 34,940 |  |  | $ | (10,430 | ) |  | $ | 24,510 |
Developed technology |  | 8.3 |  | 700 |  |  | (287 | ) |  | 413 |
Trade names and trademarks |  | 6.8 |  | 1,700 |  |  | (594 | ) |  | 1,106 |
Total |  |  |  | $ | 37,340 |  |  | $ | (11,311 | ) |  | $ | 26,029 |
(in thousands, except weighted-average useful life) |  | As of December 31, 2015
|  | Weighted-Average Useful Life (in years) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value
|  |  |  | (Restated) |  | (Restated) |  | (Restated)
Backlog |  |  |  | $ | 1,800 |  |  | $ | (1,800 | ) |  | $ | — |
Customer relationships |  | 11.5 |  | 34,940 |  |  | (5,129 | ) |  | 29,811 |
Developed technology |  | 8.2 |  | 700 |  |  | (113 | ) |  | 587 |
Trade names and trademarks |  | 7.5 |  | 1,700 |  |  | (353 | ) |  | 1,347 |
Total |  |  |  | $ | 39,140 |  |  | $ | (7,395 | ) |  | $ | 31,745 |
(in thousands, except weighted-average useful life) |  | As of December 31, 2014
|  | Weighted-Average Useful Life (in years) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value
|  |  |  | (Restated) |  | (Restated) |  | (Restated)
Backlog |  | 1.0 |  | $ | 1,200 |  |  | $ | (1,095 | ) |  | $ | 105 |
Customer relationships |  | 21.0 |  | 20,400 |  |  | (926 | ) |  | 19,474 |
Trade names and trademarks |  | 8.3 |  | 1,700 |  |  | (87 | ) |  | 1,613 |
Total |  |  |  | $ | 23,300 |  |  | $ | (2,108 | ) |  | $ | 21,192 |
Summary of Amortization Expense | Amortization expense was classified as follows in the Consolidated Statements of Operations:
(in thousands) |  | For the Year Ended December 31,
|  |  |  |  |  | 2015 |  | 2014
|  | 2017 |  | 2016 |  | (Restated) |  | (Restated)
Cost of sales |  | $ | — |  |  | $ | — |  |  | $ | 705 |  |  | $ | 1,095 |
Operating expenses |  | 4,838 |  |  | 5,716 |  |  | 4,582 |  |  | 1,013 |
Total |  | $ | 4,838 |  |  | $ | 5,716 |  |  | $ | 5,287 |  |  | $ | 2,108 |
Schedule of Future Amortization Expense | Estimated future amortization expense for intangible assets as of December 31, 2017 is as follows:
(in thousands) |  |
Year Ending December 31, |  | Estimated Amortization
2018 |  | $ | 4,227 |
2019 |  | 3,698 |
2020 |  | 3,113 |
2021 |  | 2,594 |
2022 |  | 2,184 |
2023 and beyond |  | 5,675 |
Total |  | $ | 21,491 |

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