Note 6. Derivative Liabilities

The Company’s 6.5% Convertible Senior Secured Notes due 2023 issued in May 2018 contain certain derivative features, as described in Note 7 - Convertible Notes. The table below provides a summary of the changes in fair value, including net transfers in and/or out, of all financial assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three months ended September 30, 2018:

The fair value of the derivative features of the convertible note at the balance sheet dates were calculated using the with-and-without method, a form of the income approach, valued with the following weighted average assumptions: 

Risk-free interest rate: The Company uses the risk-free interest rate of a U.S. Treasury Bill with a similar term on the date of the issuance.

Dividend yield: The Company uses a 0% expected dividend yield as the Company has not paid dividends to date and does not anticipate declaring dividends in the near future.

Volatility: The Company estimated the expected volatility of the stock price based on the corresponding volatility of the Company’s peer group stock price for a period consistent with the convertible notes’ expected term.

Remaining term: The Company’s remaining term is based on the remaining contractual term of the convertible notes.