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Organization and Significant Accounting Policies (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 unit segment | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues from external customers | $ 109,338 | $ 97,644 | $ 93,668 |
Treasury Stock, Shares, Acquired | 99,531 | 9,126 |  |
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries | 46,063 | 27,219 | 17,591 |
Percentage Of Net Income, Foreign | 42.00% | 28.00% | 19.00% |
Restricted Cash and Cash Equivalents | 1,161 |  |  |
Unbilled Contracts Receivable | 10,693 | 10,970 |  |
Number of Reportable Segments | 2 |  |  |
Number of Reporting Units | 2 |  |  |
Goodwill | 21,051 | 21,051 |  |
Finite-Lived Patents, Gross | 1,273 | 1,026 |  |
Amortization of Intangible Assets | 839 | 898 | 912 |
Depreciation | 2,175 | 2,191 | 2,808 |
Percentage of Shares Issued and Reserved for Share-based Payment Award | 12.50% |  |  |
Stock Awards Available for Issuance Under the Incentive Plan (in shares) | 671,000 |  |  |
Options, Outstanding, Number (in shares) | 1,688,500 | 1,914,000 | 1,902,000 | 2,856,125
Available-for-sale Securities, Fair Value Disclosure | 30 | 44 |  |
Treasury Stock, Value, Acquired, Cost Method | 447 | 39 |  |
Sales Revenue, Services, Net |  |  |  |
Concentration Risk, Percentage | 10.00% | 10.00% | 10.00% |
Number of Customers | 2 | 1 | 2 |
Accounts Receivable |  |  |  |
Concentration Risk, Percentage | 10.00% | 10.00% | 10.00% |
Number of Customers | 0 | 0 | 0 |
Capitalized Third-party Costs |  |  |  |
Finite-Lived Patents, Gross | 305 | 313 |  |
Minimum |  |  |  |
Standard Product Warranty Description (in years) | 1 year |  |  |
Maximum |  |  |  |
Standard Product Warranty Description (in years) | 2 years |  |  |
Antidilutive |  |  |  |
Options, Outstanding, Number (in shares) | 1,623,000 | 1,507,000 | 1,368,000 |
FUEL CHEM Segment |  |  |  |
Revenues from external customers | 36,786 | 35,203 | 42,738 |
Goodwill | 1,723 | 1,723 |  |
FUEL CHEM Segment | Sales Revenue, Services, Net |  |  |  |
Number of Customers | 1 |  | 1 |
APC Technology Segment |  |  |  |
Goodwill | 19,328 | 19,328 |  |
APC Technology Segment | Sales Revenue, Services, Net |  |  |  |
Concentration Risk, Percentage | 14.00% |  |  |
Customer One | FUEL CHEM Segment | Sales Revenue, Services, Net |  |  |  |
Concentration Risk, Percentage |  | 16.00% | 16.00% |
Customer Two | FUEL CHEM Segment |  |  |  |
Concentration Risk, Percentage |  |  | 13.00% |
Project and Non-Project |  |  |  |
Unbilled Contracts Receivable | $ 12,599 | $ 15,661 |  |

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