9. Goodwill and Intangible Assets

The Company’s goodwill and related changes during the nine months ended September 30, 2018 are as follows:


Balance at December 31, 2017	$	74,613
Goodwill from 2018 acquisitions		16,726
Adjustments to Goodwill		(420)
Balance at September 30, 2018	$	90,919

During the nine months ended September 30, 2018, the Company recorded a decrease of $420 in the acquisition date fair value of accrued expenses and other liabilities and deferred tax liabilities with respect to the acquisition of SRx, with a corresponding reduction in goodwill, as a result of additional information that became known during the period.

Goodwill is not amortized, but instead tested for impairment annually. The Company conducted its annual impairment test as of October 1, 2017 and determined that there were no indicators of impairment during 2017. The next annual impairment test will be conducted as of October 1, 2018, unless the Company identifies a triggering event in the interim. Management has not identified any triggering events during the nine months ended September 30, 2018.

Intangible assets consisted of the following as of September 30, 2018 and December 31, 2017:


	Weighted Average
	Amortization Period			Accumulated		Intangible
	(in years)	Gross Value		Amortization		Assets, net
September 30, 2018
Trade names	8.05	$	7,306	$	(2,058)	$	5,248
Client relationships	8.98		44,569		(9,257)		35,312
Non-competition agreements	6.99		6,754		(1,558)		5,196
Developed technology	7.02		29,091		(6,221)		22,870
Domain name	10.00		59		(8)		51
Total intangible assets		$	87,779	$	(19,102)	$	68,677


	Weighted Average
	Amortization Period			Accumulated		Intangible
	(in years)	Gross Value		Amortization		Assets, net
December 31, 2017
Trade names	8.56	$	6,716	$	(1,320)	$	5,396
Client relationships	8.48		34,949		(5,652)		29,297
Non-competition agreements	4.96		5,404		(739)		4,665
Developed technology	7.38		26,791		(3,438)		23,353
Domain name	10.00		29		(4)		25
Total intangible assets		$	73,889	$	(11,153)	$	62,736

Amortization expense for intangible assets for the three months ended September 30, 2018 and 2017 was $2,782 and $1,198, respectively. Amortization expense for intangible assets for the nine months ended September 30, 2018 and 2017 was $7,949 and $3,095, respectively.

The estimated amortization expense for each of the next five years and thereafter is as follows:


Years Ending December 31,
2018 (October 1 - December 31)	$	2,949
2019		11,334
2020		10,833
2021		10,787
2022		10,412
Thereafter		22,362
Total estimated amortization expense	$	68,677