7.  Intangible Assets

Intangible assets consisted of the following (in thousands):

Amortization expense for the intangible assets was $0.1 million during the first quarter of each of Fiscal 2015 and Fiscal 2014.

Expected future amortization expense of intangible assets as of June 30, 2014 is as follows (in thousands):

The manufacturing license provides the Company with the ability to manufacture recuperator cores previously purchased from Solar Turbines Incorporated (“Solar”). The Company is required to pay a per-unit royalty fee over a seventeen-year period for cores manufactured and sold by the Company using the technology. Royalties of approximately $14,700 and $25,200 were earned by Solar for the first quarter of Fiscal 2015 and 2014, respectively. Earned royalties of approximately $14,700 and $20,700 were unpaid as of June 30, 2014 and March 31, 2014, respectively, and are included in accounts payable and accrued expenses in the accompanying balance sheets.