4. Fair value measurements

The fair value of the Company’s financial assets and liabilities measured on a recurring basis were as follows:

 

 

Equity Warrants and Securities

The Company holds investments in common stock and warrants to purchase shares of common stock of Bone Biologics, Inc. (“Bone Biologics”). Both of these instruments are recorded within other long-term assets. Prior to 2018, these instruments were accounted for at cost as the fair value of these instruments was not readily determinable. Effective January 1, 2018, the Company is required to measure these equity investments at fair value and recognize any changes in fair value in net income as a result of adopting ASU 2016-01. However, for certain equity investments that do not have readily determinable fair values, the new guidance allows entities to choose to measure these investments using a new measurement alternative, which values the investments at cost, less any impairments, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer. The Company has elected to use the new measurement alternative for these equity investments in Bone Biologics, which resulted in an increase in the previously recorded value of the equity investments of $1.6 million, or $0.09 per share before taxes, which was included in other income. In addition, the Company made an additional investment in Bone Biologics during the first quarter of 2018, in which it purchased an additional 250,000 shares of common stock for $0.5 million.

 

Debt Security

The Company holds a debt security of eNeura, Inc., a privately held medical technology company that is developing devices for the treatment of migraines. The debt security matures on March 4, 2019. The fair value of the debt security, which is recorded within other current assets, is based upon significant unobservable inputs, including the use of a discounted cash flow model, requiring the Company to develop its own assumptions; therefore, the Company has categorized this asset as a Level 3 financial asset. As of March 31, 2018, the Company reassessed its estimate of fair value based on current financial information and other assumptions, resulting in a fair value of $16.1 million, which is consistent with the Company’s estimated fair value of the debt security as of December 31, 2017. This compares to an amortized cost basis in the debt security of $9.0 million.

The following table provides a reconciliation of the beginning and ending balances for debt securities measured at fair value using significant unobservable inputs (Level 3):