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Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
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
2013 |  | $ | 460 |  |  | $ | 1,175 |  |  | $ | (446 | ) |  | $ | 1,189 |
2014 |  | $ | 1,189 |  |  | $ | 1,099 |  |  | $ | (366 | ) |  | $ | 1,922 |
2015 |  | $ | 1,922 |  |  | $ | — |  |  | $ | (150 | ) |  | $ | 1,772 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The changes in accumulated other comprehensive (loss) income by component were as follows:
|  | December 31,
|  | 2015 |  | 2014
Foreign currency translation |  |  |  |
Balance at beginning of period |  | $ | (471 | ) |  | $ | 18 |
Other comprehensive (loss) income: |  |  |  |
Foreign currency translation adjustments (1) |  | (1,097 | ) |  | (489 | )
Balance at end of period |  | $ | (1,568 | ) |  | $ | (471 | )
Available-for-sale marketable securities |  |  |  |
Balance at beginning of period |  | $ | 23 |  |  | $ | 19 |
Other comprehensive income (loss): |  |  |  |
Net unrealized holding gain (loss) (2) |  | (11 | ) |  | 4 |
Deferred income taxes (2) |  | — |  |  | — |
Total other comprehensive income (loss) |  | (11 | ) |  | 4 |
Balance at end of period |  | $ | 12 |  |  | $ | 23 |
Total accumulated other comprehensive (loss) income |  | $ | (1,556 | ) |  | $ | (448 | )
(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, 2015 and 2014:
|  | 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, 2015 and 2014, and the accumulated amortization and net intangible asset value in total for all other intangible assets.
|  |  |  | 2015 |  | 2014
Description of Other Intangibles |  | Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships |  | 4-15 years |  | $ | 3,633 |  |  | $ | (3,114 | ) |  | $ | 519 |  |  | $ | 5,087 |  |  | $ | (2,690 | ) |  | $ | 2,397 |
Trademarks and trade names |  | 4-8 years |  | 441 |  |  | (382 | ) |  | 59 |  |  | 441 |  |  | (293 | ) |  | 148 |
Patent assets |  | 1-15 years |  | 3,007 |  |  | (1,210 | ) |  | 1,797 |  |  | 2,764 |  |  | (987 | ) |  | 1,777 |
Acquired technologies |  | 5-8 years |  | 7,515 |  |  | (2,746 | ) |  | 4,769 |  |  | 7,974 |  |  | (1,832 | ) |  | 6,142 |
Total |  |  |  | $ | 14,596 |  |  | $ | (7,452 | ) |  | $ | 7,144 |  |  | $ | 16,266 |  |  | $ | (5,802 | ) |  | $ | 10,464 |
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
2016 | $ | 1,700 |
2017 | 1,374 |
2018 | 1,269 |
2019 | 1,016 |
2020 | 564 |
Thereafter | 1,221 |
Total | $ | 7,144 |
Property, Plant and Equipment | The table below shows the depreciable life and cost by asset class as of December 31, 2015 and 2014, and the accumulated depreciation and net book value in total for all classes of assets.
Description of Property and Equipment |  | Depreciable Life |  | 2015 |  | 2014
Land |  |  |  | $ | 1,440 |  |  | $ | 1,440 |
Building |  | 39 years |  | 4,535 |  |  | 4,535 |
Building and leasehold improvements |  | 3-39 years |  | 5,102 |  |  | 5,115 |
Field equipment |  | 3-4 years |  | 19,797 |  |  | 19,796 |
Computer equipment and software |  | 2-3 years |  | 2,978 |  |  | 3,005 |
Furniture and fixtures |  | 3-10 years |  | 1,527 |  |  | 1,525 |
Vehicles |  | 5 years |  | 36 |  |  | 36 |
Total cost |  |  |  | 35,415 |  |  | 35,452 |
Less accumulated depreciation |  |  |  | (23,414 | ) |  | (21,925 | )
Total net book value |  |  |  | $ | 12,001 |  |  | $ | 13,527 |
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:
|  | 2015 |  | 2014 |  | 2013
Basic weighted-average shares |  | 23,101,000 |  |  | 22,782,000 |  |  | 22,286,000 |
Conversion of unsecured loan notes |  | — |  |  | — |  |  | 7,000 |
Unexercised options and unvested restricted stock units |  | — |  |  | — |  |  | 286,000 |
Diluted weighted-average shares |  | 23,101,000 |  |  | 22,782,000 |  |  | 22,579,000 |

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