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Organization and Significant Accounting Policies (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) shares | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) shares | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) customer unit shares | Dec. 31, 2015 USD ($) customer shares | Dec. 31, 2014 USD ($) customer shares | Dec. 31, 2013 shares
Revenues from external customers | $ 9,568,000 | $ 12,596,000 | $ 15,175,000 | $ 17,822,000 | $ 18,201,000 | $ 21,677,000 | $ 18,683,000 | $ 15,103,000 | $ 55,161,000 | $ 73,664,000 | $ 79,017,000 |
Percentage of foreign net income |  |  |  |  |  |  |  |  | 23.00% | 30.00% | 36.00% |
Restricted cash | 6,020,000 |  |  |  | 0 |  |  |  | $ 6,020,000 | $ 0 |  |
Unbilled contracts receivable | 5,025,000 |  |  |  | 5,454,000 |  |  |  | 5,025,000 | 5,454,000 |  |
Bankers acceptance | 838,000 |  |  |  | 2,144,000 |  |  |  | 838,000 | 2,144,000 |  |
Excess and obsolete inventory reserve | 825,000 |  |  |  | 0 |  |  |  | $ 825,000 | 0 |  |
Number of reporting units | unit |  |  |  |  |  |  |  |  | 2 |  |  |
Goodwill and intangible assets impairment |  |  |  |  |  |  |  |  | $ 2,074,000 | 1,425,000 | $ 23,400,000 |
Intangible assets impairment |  |  |  |  |  |  |  |  | 0 | 0 | 23,400,000 |
Patents | 1,656,000 |  |  |  | $ 1,699,000 |  |  |  | 1,656,000 | 1,699,000 |  |
Identifiable intangible assets | $ 5,158,000 |  |  |  |  |  |  |  | 5,158,000 |  |  |
Purchases of other intangible assets |  |  |  |  |  |  |  |  | $ 0 | 0 | 3,010,000 |
Useful Life (Years) |  |  |  |  |  |  |  |  | 5 years |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 1,720,000 | 2,138,000 | 2,384,000 |
Depreciation |  |  |  |  |  |  |  |  | $ 1,780,000 | $ 2,067,000 | $ 1,922,000 |
Options outstanding (in shares) | shares | 1,039,750 |  |  |  | 1,191,125 |  |  |  | 1,039,750 | 1,191,125 | 1,546,500 | 1,688,500
Antidilutive equity awards (In shares) | shares |  |  |  |  |  |  |  |  | 184,000 | 169,000 |  |
Available-for-sale securities | $ 9,000 |  |  |  | $ 19,000 |  |  |  | $ 9,000 | $ 19,000 |  |
Treasury shares withheld (in shares) | shares |  |  |  |  |  |  |  |  | 103,097 | 84,486 |  |
Treasury shares withheld |  |  |  |  |  |  |  |  | $ 172,000 | $ 252,000 | $ 304,000 |
Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  | 1 | 2 | 2 |
Concentration risk percentage |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Concentration risk percentage |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |
Capitalized Third-party Costs |  |  |  |  |  |  |  |  |  |  |  |
Patents | $ 166,000 |  |  |  | $ 244,000 |  |  |  | $ 166,000 | $ 244,000 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Warranty period (in years) |  |  |  |  |  |  |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Warranty period (in years) |  |  |  |  |  |  |  |  | 2 years |  |  |
Antidilutive |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | shares | 1,800,000 |  |  |  | 2,068,000 |  |  |  | 1,800,000 | 2,068,000 | 1,628,000 |
FUEL CHEM Segment |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 21,109,000 | $ 30,179,000 | $ 36,986,000 |
Goodwill and intangible assets impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Intangible assets impairment |  |  |  |  |  |  |  |  | $ 0 | 0 | 0 |
FUEL CHEM Segment | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 19.00% |  |  |
APC Technology Segment |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets impairment |  |  |  |  | $ 23,400,000 |  |  |  | $ 0 | $ 0 | $ 23,400,000 |
Customer One | FUEL CHEM Segment | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |  |
Number of customers |  |  |  |  |  |  |  |  |  | 1 | 1 |
Concentration risk percentage |  |  |  |  |  |  |  |  |  | 20.00% | 14.00% |
Customer One | APC Technology Segment | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  |  | 11.00% | 18.00% |
Project and Non-Project |  |  |  |  |  |  |  |  |  |  |  |
Unbilled contracts receivable | $ 6,755,000 |  |  |  | $ 7,312,000 |  |  |  | 6,755,000 | $ 7,312,000 |  |
Foreign |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | $ 12,616,000 | $ 22,179,000 | $ 28,116,000 |
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards |  |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance | shares | 4,400,676 |  |  |  |  |  |  |  | 4,400,676 |  |  |
Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance | shares | 748,742 |  |  |  |  |  |  |  | 748,742 |  |  |
Inventories |  |  |  |  |  |  |  |  |  |  |  |
Excess and obsolete inventory reserve | $ 175,000 |  |  |  |  |  |  |  | $ 175,000 |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |
Excess and obsolete inventory reserve | 650 |  |  |  |  |  |  |  | 650 |  |  |
Chinese Subsidiary |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents | 3,222,000 |  |  |  |  |  |  |  | 3,222,000 |  |  |
Italian Subsidiary |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 2,408,000 |  |  |  |  |  |  |  | 2,408,000 |  |  |
Carbonette Fuel Conversion Process |  |  |  |  |  |  |  |  |  |  |  |
Purchases of other intangible assets |  |  |  |  |  |  |  |  | $ 3,010,000 |  |  |

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