	September 30, 2021			June 30, 2021
Balance at the beginning of the period	$	57,960		$	57,717
Currency translation		(9	)		243
Balance at the end of the period	$	57,951		$	57,960

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 did not identify any triggering events that would indicate potential impairment of its definite-lived intangible and long-lived assets as of September 30, 2021.

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

		September 30, 2021							June 30, 2021
	Useful Lives	Gross Carrying Amount		Accumulated Amortization			Net Amount		Gross Carrying Amount		Accumulated Amortization			Net Amount
	(in years)
Patent license	2 - 7	$	1,170	$	(792	)	$	378	$	1,170	$	(735	)	$	435

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 September 30, 2021 and June 30, 2021.

Amortization expense related to intangible assets for the three months ended September 30, 2021 and 2020 were $0.06 million for both periods.

The estimated future amortization expense of acquired intangible assets as of September 30, 2021 is as follows (in thousands):

Year Ending June 30,	Amount
2022 (remaining 9 months)	$	128
2023		143
2024		107
2025		—
	$	378