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Intangible Assets, Net
 12 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net
Intangible Assets, Net
Intangible assets, net consist of (in thousands):
 
June 30,
 
2017
 
2016
Patent costs
$
2,330

 
$
2,330

Accumulated amortization
(1,328
)
 
(1,181
)
Total definite-lived intangible assets, net
1,002

 
1,149

 
 
 
 
Trademarks and other indefinite-lived intangible assets
245

 
595

Total intangible assets, net
$
1,247

 
$
1,744


Amortization expense totaled $0.1 million, $0.1 million and $0.1 million for the years ended June 30, 2017, 2016 and 2015, respectively. As of June 30, 2017, the remaining weighted-average amortization period for definite-lived intangible assets was 7.75 years. Annual estimated amortization expense is expected to approximate $0.1 million for each of the five succeeding fiscal years.