Consolidated Statements of Operations (Parenthetical) (Unaudited) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Direct operating expenses	$ 28,336	$ 22,140	$ 54,897	$ 48,819
Non-cash stock-based compensation			2,206	1,592
Depreciation and amortization	5,074	3,873	10,258	8,385
Related Parties
Direct operating expenses	1,952	1,386	3,889	3,605
Depreciation and amortization	308	307	615	614
Direct Operating Expenses
Non-cash stock-based compensation	334	104	650	235
Depreciation and amortization	3,787	2,800	7,629	5,931
Corporate Expenses
Non-cash stock-based compensation	801	699	1,556	1,357
Depreciation and amortization	117	182	305	355
Selling, General and Administrative Expenses
Depreciation and amortization	$ 1,170	$ 891	$ 2,324	$ 2,099

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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