NOTE 7.  PROPERTY AND EQUIPMENT

We account for property and equipment in accordance with FASB ASC Topic 360-10, Property, Plant and Equipment.  

The following is a summary of the categories of our property and equipment:

Depreciation expense was approximately $2.7 million and $3.0 million for the three month periods ended September 30, 2019 and 2018, respectively, and $8.5 million and $9.1 million for the nine month periods ended September 30, 2019 and 2018, respectively. We periodically review long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount of the assets may not be fully recoverable. This review requires us to estimate the fair value of the assets using significant unobservable inputs that reflect our own assumptions about the estimates that market participants would use in measuring fair value, including assumptions about risk. If actual future results are less favorable than the assumptions and estimates we used, we are subject to future impairment charges, the amount of which may be material. There were no indications of impairment during the period ended September 30, 2019.