|12 Months Ended|
Mar. 31, 2016
5. Intangible Assets
Intangible assets consisted of the following (in thousands):
Amortization expense for the intangible assets was $0.4 million, $0.5 million and $0.5 million for each of the years ended March 31, 2016, 2015 and 2014. Included in amortization expense for the three months ended March 31, 2016, is approximately $0.1 million of purchased TA100 backlog that was written off to align with management’s decision to limit the production of TA100 systems on a case-by-case basis for key customers.
Expected future amortization expense of intangible assets as of March 31, 2016 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 $35,000, $71,100, and $83,000 were earned by Solar for the years ended March 31, 2016, 2015 and 2014, respectively. Earned royalties of approximately $35,000 and $19,300 were unpaid as of March 31, 2016 and 2015, respectively, and are included in accrued expenses in the accompanying balance sheets.
The entire disclosure for all or part of the information related to intangible assets.
Reference 1: http://www.xbrl.org/2003/role/presentationRef