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Nature of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Consolidated Financial Statements Include Accounts of Subsidiaries | Principles of consolidation—Our consolidated financial statements include the accounts of the following subsidiaries:
|  | % Owned As Of December 31, 2017 |
CECO Group, Inc. |  |  | 100 | %
CECO Group Global Holdings LLC |  |  | 100 | %
CECO Filters, Inc. and Subsidiaries (“CFI”) |  |  | 99 | %
The Kirk & Blum Manufacturing Company |  |  | 100 | %
CECO Air Quality Solutions, Inc. |  |  | 100 | %
EFFOX, Inc. (“Effox”) |  |  | 100 | %
Fisher-Klosterman, Inc. (“FKI”) |  |  | 100 | %
Flextor, Inc. (“Flextor”) |  |  | 100 | %
Adwest Technologies, Inc. (“Adwest”) |  |  | 100 | %
Aarding Thermal Acoustics B.V. (“Aarding”) |  |  | 100 | %
Met-Pro Technologies LLC (“Met-Pro”) |  |  | 100 | %
Peerless Mfg. Co. (“PMFG”) |  |  | 100 | %
Number of Shares Outstanding for Calculation of Earnings (Loss) Per Share | Earnings per share—The computational components of basic and diluted earnings per share for 2017, 2016 and 2015 are below.
|  | For the Year Ended December 31, 2017 |
|  | Numerator (Loss) |  |  | Denominator (Shares) |  |  | Per Share Amount |
Basic net loss and loss per share |  | $ | (3,029 | ) |  |  | 34,445 |  |  | $ | (0.09 | )
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan |  |  | — |  |  |  | — |  |  |  | — |
Diluted net loss and loss per share |  | $ | (3,029 | ) |  |  | 34,445 |  |  | $ | (0.09 | )
|  | For the Year Ended December 31, 2016 |
|  | Numerator (Loss) |  |  | Denominator (Shares) |  |  | Per Share Amount |
Basic net loss and loss per share |  | $ | (38,218 | ) |  |  | 33,980 |  |  | $ | (1.12 | )
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan |  |  | — |  |  |  | — |  |  |  | — |
Diluted net loss and loss per share |  | $ | (38,218 | ) |  |  | 33,980 |  |  | $ | (1.12 | )
|  | For the Year Ended December 31, 2015 |
|  | Numerator (Loss) |  |  | Denominator (Shares) |  |  | Per Share Amount |
Basic net loss and loss per share |  | $ | (5,602 | ) |  |  | 28,792 |  |  | $ | (0.19 | )
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan |  |  | — |  |  |  | — |  |  |  | — |
Diluted net loss and loss per share |  | $ | (5,602 | ) |  |  | 28,792 |  |  | $ | (0.19 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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