Fair Value of Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value of Assets and Liabilities

Summary of financial assets and liabilities measured at fair value on a recurring basis

	Level 1		Level 2		Level 3		Fair Value
December 31, 2019
Assets
Money market accounts	$	54,014,591	$	—	$	—	$	54,014,591
Total assets measured at fair value	$	54,014,591	$	—	$	—	$	54,014,591
Liabilities
Acquisition-related contingent consideration obligations-short term	$	—	$	—	$	4,825,000	$	4,825,000
Acquisition-related contingent consideration obligations-long term		—		—		9,900,000		9,900,000
Interest rate swap agreements		—		8,339,288		—		8,339,288
Total liabilities measured at fair value	$	—	$	8,339,288	$	14,725,000	$	23,064,288

	Level 1		Level 2		Level 3		Fair Value
December 31, 2018
Assets
Money market accounts	$	16,126,899	$	—	$	—	$	16,126,899
Interest rate swap agreement		—		943,134		—		943,134
Total assets measured at fair value	$	16,126,899	$	943,134	$	—	$	17,070,033
Liabilities
Acquisition-related contingent consideration obligations-short term	$	—	$	—	$	13,625,000	$	13,625,000
Acquisition-related contingent consideration obligations-long term		—		—		1,625,000		1,625,000
Interest rate swap agreements		—		396,302		—		396,302
Total liabilities measured at fair value	$	—	$	396,302	$	15,250,000	$	15,646,302

Reconciliation of contingent consideration liabilities related to acquisitions

Year Ended December 31, 2019	Beginning Balance		Additions		Payments		Gain		Ending Balance
Contingent consideration	$	15,250,000	$	12,625,000	$	(13,000,000)	$	(150,000)	$	14,725,000
Total Level 3 liabilities	$	15,250,000	$	12,625,000	$	(13,000,000)	$	(150,000)	$	14,725,000
Year Ended December 31, 2018
Contingent consideration	$	—	$	15,250,000	$	—	$	—	$	15,250,000
Total Level 3 liabilities	$	—	$	15,250,000	$	—	$	—	$	15,250,000

Summary of non-financial assets measured on a non-recurring basis

	As of December 31,
	2019		2018
Significant unobservable inputs (Level 3):
Goodwill (annual impairment assessment)	$	266,790,518	$	202,436,212