The allocation of the purchase price directly affects the following items in the consolidated financial statements:
The amount of purchase price allocated to the various tangible and intangible assets, liabilities and non-controlling interests on the balance sheet;
The amounts allocated to the value of favorable and unfavorable rate PPAs and REC agreements are amortized to revenue over the remaining non-cancelable terms of the respective arrangement. The amounts allocated to all other tangible assets and intangibles are amortized to depreciation or amortization expense, with the exception of favorable and unfavorable rate land leases and unfavorable rate O&M contracts which are amortized to cost of operations; and
The period of time over which tangible and intangible assets and liabilities are depreciated or amortized varies, and thus, changes in the amounts allocated to these assets and liabilities will have a direct impact on the Company's results of operations.
Assets Held for Sale
The Company records assets held for sale at the lower of the carrying value or fair value less costs to sell. The following criteria are used to determine if property is held for sale: (i) management has the authority and commits to a plan to sell the property; (ii) the property is available for immediate sale in its present condition; (iii) there is an active program to locate a buyer and the plan to sell the property has been initiated; (iv) the sale of the property is probable within one year; (v) the property is being actively marketed at a reasonable price relative to its current fair value; and (vi) it is unlikely that the plan to sell will be withdrawn or that significant changes to the plan will be made.
In determining the fair value of the assets less costs to sell, the Company considers factors including current sales prices for comparable assets in the region, recent market analysis studies, appraisals and any recent legitimate offers. If the estimated fair value less costs to sell of an asset is less than its current carrying value, the asset is written down to its estimated fair value less costs to sell. Due to uncertainties in the estimation process, it is reasonably possible that actual results could differ from the estimates used in the Company's historical analysis. The Company's assumptions about project sale prices require significant judgment because the current market is highly sensitive to changes in economic conditions. The Company estimates the fair values of assets held for sale based on current market conditions and assumptions made by management, which may differ from actual results and may result in additional impairments if market conditions deteriorate.
When assets are classified as held for sale, the Company does not record depreciation or amortization for the respective renewable energy facilities or intangibles.
At December 31, 2018, there were no assets held for sale.
Stock-based compensation expense for all share-based payment awards to employees who provide services to the Company is based on the estimated grant-date fair value. The Company recognizes these compensation costs on a straight-line basis over the requisite service period of the award, which is generally the award vesting term. For ratable awards, the Company recognizes compensation costs for all grants on a straight-line basis over the requisite service period of the entire award. The Company recognizes the effect of forfeitures in compensation cost when they occur.
Deferred Compensation Plan
The Company sponsors a retirement saving plan that qualifies as a deferred compensation plan under Section 401(k) of the Internal Revenue Code. Eligible U.S. employees may elect to defer a percentage of their qualified compensation for income tax purposes through payroll deductions and the Company matches a percentage of the contributions based on employees’ elective deferrals. The Company’s total matching contribution expense under the arrangement was $0.6 million, $0.5 million, $0.5 million for the years ended December 31, 2018, 2017 and 2016, respectively.
The Company accounts for restructuring costs in accordance with ASC 712 and ASC 420, as applicable. In connection with the consummation of the Merger and the relocation of the Company’s headquarters to New York, New York, the Company