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Goodwill
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
The following presents changes in goodwill during 2020 and 2019 (in thousands):
20202019
Beginning of period$4,453 $— 
Acquisition of American Electric
— 139 
Acquisition of Diversenergy
— 4,314 
End of period$4,453 $4,453 
Business acquisitions during the third quarter of 2019 account for the balance of goodwill as of December 31, 2020. The Company performs an impairment test for goodwill annually or more frequently if indicators of potential impairment exist. We completed our annual goodwill impairment test as of September 30, 2020 and no impairments were identified.
See Note 2—Acquisitions for discussion of the acquisitions.