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Management Incentive Plans | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Management Incentive Plan Disclosure [Text Block] | Note 17 – Management Incentive Plans Upon approval of the Business Combination, the Company adopted the Limbach Holdings, Inc. Omnibus Incentive Plan (the “2016 Plan”). Certain employees, directors and consultants will be eligible to be granted awards under the 2016 Plan, other than incentive stock options, which may be granted only to employees. The Company has reserved 800,000 shares of its common stock for issuance under the 2016 Plan, as may be adjusted for stock splits, stock dividends, and similar changes in the Company’s common stock. In connection with an event determined to constitute a change in control, the plan administrator may accelerate the vesting of awards previously granted. All awards are made in the form of shares only. Service-Based Awards In 2018, the Company granted 80,267 service-based RSUs to its executives, certain employees, and non-employee directors under the 2016 Plan. The following table summarizes our service-based RSU activity for the six months ended June 30, 2018:
|  | Awards |  |  | Weighted-Average ‎ Grant Date ‎ Fair Value |
Unvested at December 31, 2017 |  |  | 176,965 |  |  | $ | 13.25 |
Granted |  |  | 80,267 |  |  |  | 13.41 |
Vested |  |  | (26,777 | ) |  |  | 13.24 |
Forfeited |  |  | (2,667 | ) |  |  | 13.25 |
Unvested at June 30, 2018 |  |  | 227,788 |  |  | $ | 13.31 |
Performance-Based Awards In 2018, the Company granted 60,000 performance-based RSUs (“PRSUs”) to its executives and certain employees under the 2016 Plan. The Company will recognize stock-based compensation expense for these awards over the vesting period based on the projected probability of achievement of certain performance conditions as of the end of each reporting period during the performance period and may periodically adjust the recognition of such expense, as necessary, in response to any changes in the Company’s forecasts with respect to the performance conditions. For the three and six months ended June 30, 2018, the Company did not recognize any stock-based compensation expense related to these awards or to the awards that were granted on August 30, 2017. The following table summarizes our PRSU activity for the six months ended June 30, 2018:
|  | Awards |  |  | Weighted-Average ‎ Grant Date ‎ Fair Value |
Unvested at December 31, 2017 |  |  | 66,500 |  |  | $ | 13.25 |
Granted |  |  | 60,000 |  |  |  | 13.51 |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | (2,000 | ) |  |  | 13.25 |
Unvested at June 30, 2018 |  |  | 124,500 |  |  | $ | 13.38 |
Market-Based Awards The following table summarizes our market-based RSU activity for the six months ended June 30, 2018:
|  | Awards |  |  | Weighted- ‎ Average ‎ Grant ‎ Date ‎ Fair Value |
Unvested at December 31, 2017 |  |  | 146,500 |  |  | $ | 6.58 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | - |  |  |  | - |
Forfeited |  |  | (2,000 | ) |  |  | 6.58 |
Unvested at June 30, 2018 |  |  | 144,500 |  |  | $ | 6.58 |
Total recognized stock-based compensation expense amounted to $0.7 million and $1.1 million for the three and six months ended June 30, 2018, respectively. Total unrecognized stock-based compensation expense related to unvested RSUs which are probable of vesting was $2.2 million at June 30, 2018. These costs are expected to be recognized over a weighted average period of 1.82 years.

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