On September 19, 2018, the Company paid in full the negotiated royalty settlement of $3.0 million to Carrier, and as such, there is no further royalty obligation to Carrier. The prepaid royalty of $3.0 million has been recorded under the captions “Prepaid expenses and other current assets” and “Other assets” in the accompanying condensed consolidated balance sheets and will be amortized in the accompanying condensed consolidated statement of operations over a 15-year amortization period through September 2033 using an effective royalty rate. The effective royalty rate is calculated as the prepaid royalty settlement divided by total projected C200 System units over the 15-year amortization period. On a quarterly basis, the Company will perform a re-forecast of C200 System unit shipments, to see if a change needs to be made to the effective royalty rate. Accordingly, if the Company’s future projections change, its effective royalty rates would change, which could affect the amount and timing of royalty expense the Company recognizes. If impairment exists, then the prepaid royalty asset could be written down to fair value. Prepaid royalties are classified as current assets to the extent that such amounts will be recognized in the Company’s condensed consolidated statements of operations within the next 12 months. The current and long-term portions of prepaid royalties, included in other current assets and other assets, respectively, consisted of (in thousands):