Intangible Assets, Net

At June 30, 2019, the Company’s intangible assets, net, consisted of the following:



	Useful Life (Years)	Gross June 30, 2019		Accumulated Amortization			Net June 30, 2019
Indefinite Lived Assets:
Medicare license	N/A	$	1,994,000	$	—		$	1,994,000
Amortized Intangible Assets:
Network relationships	11-15	139,741,000		(54,094,505		)	85,646,495
Management contracts	15	22,832,000		(8,616,362		)	14,215,638
Member relationships	12	6,696,000		(1,820,905		)	4,875,095
Patient management platform	5	2,060,000		(652,333		)	1,407,667
Tradename/trademarks	20	1,011,000		(80,037		)	930,963
		$	174,334,000	$	(65,264,142	)	$	109,069,858

At December 31, 2018, the Company’s intangible assets, net, consisted of the following:



	Useful Life (Years)	Gross December 31, 2018		Accumulated Amortization			Net December 31, 2018
Indefinite Lived Assets:
Medicare license	N/A	$	1,994,000	$	—		$	1,994,000
Amortized Intangible Assets:
Network relationships	11-15	109,883,000		(48,361,773		)	61,521,227
Management contracts	20	22,832,000		(7,447,581		)	15,384,419
Member relationships	12	6,696,000		(1,289,667		)	5,406,333
Patient management platform	5	2,060,000		(446,333		)	1,613,667
Tradename/trademarks	20	1,011,000		(54,763		)	956,237
		$	144,476,000	$	(57,600,117	)	$	86,875,883

Included in depreciation and amortization on the accompanying condensed consolidated statements of income is amortization expense of $3.8 million and $4.2 million (excluding $0.1 million of amortization expense for exclusivity incentives) for the three months ended June 30, 2019 and 2018, respectively, and $7.7 million and $8.6 million (excluding $0.2 million of amortization expense for exclusivity incentives) for the six months ended June 30, 2019 and 2018, respectively.

Future amortization expense is estimated to be as follows for the years ending December 31:



	Amount

2019 (excluding the six months ended June 30, 2019)	$	8,155,000
2020	14,968,000
2021	13,257,000
2022	11,744,000
2023	10,090,000
Thereafter	48,862,000

	$	107,076,000