	March 31, 2020			June 30, 2019
Balance at the beginning of the period	$	57,770		$	57,855
Currency translation		(69	)		(85	)
Balance at the end of the period	$	57,701		$	57,770

During the third quarter of fiscal year 2020, the Company reviewed for possible triggering events due to circumstances surrounding the COVID-19 pandemic. No impairment loss on the Company’s intangible assets or goodwill during the three and nine months ended March 31, 2020 was recorded as a result of such review.

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

			March 31, 2020							June 30, 2019
	Useful Lives		Gross Carrying Amount		Accumulated Amortization			Net Amount		Gross Carrying Amount		Accumulated Amortization			Net Amount
	(in years)
Patent license		7	$	1,170	$	(450	)	$	720	$	1,000	$	(321	)	$	679

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 March 31, 2020 and June 30, 2019.

Amortization expense related to intangible assets for the three and nine months ended March 31, 2020, was $0.06 million and $0.1 million, respectively. Amortization expense related to intangible assets for the three and nine months ended March 31, 2019 was $0.03 million and $0.07 million, respectively.

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

Year Ending June 30,	Amount
2020 (remaining 3 months)	$	57
2021		228
2022		185
2023		143
2024		107
	$	720