NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (continued)
in the SunTrust Credit Agreement. Our unused commitment fee as of September 30, 2018 was 0.25%, and the revolving credit facility remains undrawn as of that date.
The SunTrust Credit Agreement contains affirmative and financial covenants regarding the operations of our business and certain negative covenants that, among other things, limit our ability to incur additional indebtedness, grant certain liens, make certain investments, merge or consolidate, make certain restricted payments and engage in certain asset dispositions, including a sale of all, or substantially all, of our property. As of September 30, 2018, we were in compliance with our covenants.
As of September 30, 2018 and December 31, 2017, we were authorized to issue 200,000,000 shares of common stock. As of September 30, 2018 and December 31, 2017, we had 33,212,058 and 32,460,668 shares issued and outstanding, respectively. During the three months ended March 31, 2018, in accordance with the squeeze-out procedures under Swiss law, we issued 58,786 shares to the remaining stockholders of LifeWatch. See “Note 3. Acquisitions” for further details related to the LifeWatch acquisition.
As of September 30, 2018, we were authorized to issue 10,000,000 shares of preferred stock. As of September 30, 2018 and December 31, 2017, there were no shares of preferred stock issued or outstanding.
During 2018, after a formal restructuring of shareholdings approved by the board of directors of LifeWatch Turkey Holdings AG (“LifeWatch Turkey”), we became the sole shareholder of LifeWatch Turkey. No cash or other consideration was exchanged to effect this transaction. As a result, we no longer reflect a noncontrolling interest in our consolidated balance sheet; however, we continue to reflect the net loss attributable to the noncontrolling interest on our consolidated statement of operations for the period of time where we did not own the entire entity.
11. Stock-Based Compensation
We have three stock plans: our 2017 Omnibus Incentive Plan (“OIP”), our 2008 Equity Incentive Plan (the “2008 Plan”) and our 2003 Equity Incentive Plan (the “2003 Plan”) (collectively, the “Plans”). The OIP is the only remaining stock plan actively granting new stock options or units. The purpose of these stock plans was, and the OIP is, to grant incentive stock options to employees and non-qualified stock options, RSUs, performance stock and other stock-based incentive awards to officers, directors, employees and consultants. The Plans are administered by our Board of Directors (the “Board”) or its delegates. The number, type, exercise price, and vesting terms of awards are determined by the Board or its delegates in accordance with the terms of the Plans. The stock options granted expire on a date specified by the Board but generally not more than ten years from the grant date. Stock option grants to employees generally vest over four years while RSUs generally vest after three years.