Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Direct operating expenses	$ 28,583	$ 24,178	$ 83,480	$ 72,997
Non-cash stock-based compensation			3,300	2,408
Depreciation and amortization	5,901	3,934	16,159	12,319
Related Parties
Direct operating expenses	2,121	2,263	6,010	5,868
Depreciation and amortization	306	306	921	920
Direct Operating Expenses
Non-cash stock-based compensation	321	148	971	383
Depreciation and amortization	2,591	2,753	10,220	8,684
Corporate Expenses
Non-cash stock-based compensation	773	668	2,329	2,025
Depreciation and amortization	96	180	401	534
Selling, General and Administrative Expenses
Depreciation and amortization	$ 3,214	$ 1,001	$ 5,538	$ 3,101

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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