	December 31, 2020		June 30, 2020
Balance at the beginning of the period	$	57,717	$	57,770
Currency translation		246		(53	)
Balance at the end of the period	$	57,963	$	57,717

In the second quarter of fiscal 2021, the Company performed its annual goodwill impairment test and determined that there was no impairment to goodwill. The Company continues to monitor its recorded goodwill for indicators of impairment.

The Company’s carrying amount of acquired intangible assets, net, is as follows (in thousands):

		December 31, 2020							June 30, 2020
	Useful Lives	Gross Carrying Amount		Accumulated Amortization			Net Amount		Gross Carrying Amount		Accumulated Amortization			Net Amount
	(in years)
Patent license	2 - 7	$	1,170	$	(621	)	$	549	$	1,170	$	(507	)	$	663

During fiscal 2017, the Company purchased a patent license with a useful life of seven years. During the quarter ending March 31, 2020, the Company purchased a patent license for $170 thousand with a useful life of two years. The Company did not identify any triggering events that would indicate potential impairment of its definite-lived intangible and long-lived assets as of December 31, 2020 and June 30, 2020.

Amortization expense related to intangible assets for the three and six months ended December 31, 2020, was $0.06 million and $0.11 million, respectively. Amortization expense related to intangible assets for the three and six months ended December 31, 2019 was $0.04 million and $0.07 million, respectively.

The estimated future amortization expense of acquired intangible assets as of December 31, 2020 is as follows (in thousands):

Year Ending June 30,	Amount
2021 (remaining 6 months)	$	114
2022		185
2023		143
2024		107
	$	549