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Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Accounting Policies [Abstract] |
Allowance for Credit Losses on Financing Receivables | The table below sets forth the components of the Allowance for Doubtful Accounts for the years ended December 31.
Year |  | Balance at January 1 |  | Provision charged to expense |  | Write-offs / Recoveries |  | Balance at December 31
2014 |  | $ | 1,189 |  |  | $ | 1,099 |  |  | $ | (366 | ) |  | $ | 1,922 |
2015 |  | $ | 1,922 |  |  | $ | — |  |  | $ | (150 | ) |  | $ | 1,772 |
2016 |  | $ | 1,772 |  |  | $ | 172 |  |  | $ | (375 | ) |  | $ | 1,569 |
Schedule of Excess and Obsolete Inventory Reserve | The table below sets forth the components of the Excess and Obsolete Inventory Reserve for the years ended December 31.
Year |  | Balance at January 1 |  | Provision charged to expense |  | Write-offs / Recoveries |  | Balance at December 31
2016 |  | $ | — |  |  | $ | 825 |  |  | $ | — |  |  | $ | 825 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The changes in accumulated other comprehensive (loss) by component were as follows:
|  | December 31,
|  | 2016 |  | 2015
Foreign currency translation |  |  |  |
Balance at beginning of period |  | $ | (1,568 | ) |  | $ | (471 | )
Other comprehensive (loss): |  |  |  |
Foreign currency translation adjustments (1) |  | (6 | ) |  | (1,097 | )
Balance at end of period |  | $ | (1,574 | ) |  | $ | (1,568 | )
Available-for-sale marketable securities |  |  |  |
Balance at beginning of period |  | $ | 12 |  |  | $ | 23 |
Other comprehensive (loss): |  |  |  |
Net unrealized holding (loss) (2) |  | (6 | ) |  | (11 | )
Balance at end of period |  | $ | 6 |  |  | $ | 12 |
Total accumulated other comprehensive (loss) |  | $ | (1,568 | ) |  | $ | (1,556 | )
(1) | In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.
(2) | In all periods presented, there were no realized holding gains or losses and therefore no amounts were reclassified to earnings.
Schedule of Goodwill | The following table shows our goodwill activity by reporting unit during the periods ending December 31, 2016 and 2015:
|  | 2016
Reporting Unit |  | Beginning Carrying Amount |  | Acquired Goodwill |  | Impairment Charge |  | Ending Carrying Amount
FUEL CHEM Technology Segment |  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
APC Technology Segment |  | — |  |  | — |  |  | — |  |  | — |
|  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
|  | 2015
Reporting Unit |  | Beginning Carrying Amount |  | Acquired Goodwill |  | Impairment Charge |  | Ending Carrying Amount
FUEL CHEM Technology Segment |  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
APC Technology Segment |  | — |  |  | — |  |  | — |  |  | — |
|  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
|  | 2014
Reporting Unit |  | Beginning Carrying Amount |  | Acquired Goodwill |  | Impairment Charge |  | Ending Carrying Amount
FUEL CHEM Technology Segment |  | $ | 2,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,116 |
APC Technology Segment |  | 18,935 |  |  | 4,465 |  |  | (23,400 | ) |  | — |
|  | $ | 21,051 |  |  | $ | 4,465 |  |  | $ | (23,400 | ) |  | $ | 2,116 |
Schedule of Finite-Lived Intangible Assets | The table below shows the amortization period and other intangible asset cost by intangible asset as of December 31, 2016 and 2015, and the accumulated amortization and net intangible asset value in total for all other intangible assets.
|  |  |  | 2016 |  | 2015
Description of Other Intangibles |  | Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships |  | 11-15 years |  | $ | 3,119 |  |  | $ | (2,979 | ) |  | $ | 140 |  |  | $ | 3,633 |  |  | $ | (3,114 | ) |  | $ | 519 |
Trademarks and trade names |  | 8 years |  | 351 |  |  | (351 | ) |  | — |  |  | 441 |  |  | (382 | ) |  | 59 |
Patent assets |  | 1- 20 years |  | 3,100 |  |  | (1,444 | ) |  | 1,656 |  |  | 3,007 |  |  | (1,210 | ) |  | 1,797 |
Acquired technologies |  | 5-8 years |  | 4,138 |  |  | (2,483 | ) |  | 1,655 |  |  | 7,515 |  |  | (2,746 | ) |  | 4,769 |
Total |  |  |  | $ | 10,708 |  |  | $ | (7,257 | ) |  | $ | 3,451 |  |  | $ | 14,596 |  |  | $ | (7,452 | ) |  | $ | 7,144 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The table below shows the estimated future amortization expense for intangible assets:
Year | Estimated Amortization Expense
2017 | $ | 805 |
2018 | 785 |
2019 | 574 |
2020 | 123 |
2021 | 123 |
Thereafter | 1,041 |
Total | $ | 3,451 |
Property, Plant and Equipment | The table below shows the depreciable life and cost by asset class as of December 31, 2016 and 2015, and the accumulated depreciation and net book value in total for all classes of assets.
Description of Property and Equipment |  | Depreciable Life |  | 2016 |  | 2015
Land |  |  |  | $ | 1,440 |  |  | $ | 1,440 |
Building |  | 39 years |  | 4,535 |  |  | 4,535 |
Building and leasehold improvements |  | 3-39 years |  | 5,087 |  |  | 5,102 |
Field equipment |  | 3-4 years |  | 19,870 |  |  | 19,797 |
Computer equipment and software |  | 2-3 years |  | 2,973 |  |  | 2,978 |
Furniture and fixtures |  | 3-10 years |  | 1,521 |  |  | 1,527 |
Vehicles |  | 5 years |  | 36 |  |  | 36 |
Total cost |  |  |  | 35,462 |  |  | 35,415 |
Less accumulated depreciation |  |  |  | (24,542 | ) |  | (23,414 | )
Total net book value |  |  |  | $ | 10,920 |  |  | $ | 12,001 |
Schedule of Earnings Per Share, Basic and Diluted | The table below sets forth the weighted-average shares used at December 31 in calculating earnings (loss) per share:
|  | 2016 |  | 2015 |  | 2014
Basic weighted-average shares |  | 23,365,000 |  |  | 23,101,000 |  |  | 22,782,000 |
Conversion of unsecured loan notes |  | — |  |  | — |  |  | — |
Unexercised options and unvested restricted stock units |  | — |  |  | — |  |  | — |
Diluted weighted-average shares |  | 23,365,000 |  |  | 23,101,000 |  |  | 22,782,000 |

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