Stock options to purchase 576,000 shares of common stock were excluded from the computation of diluted earnings per share during the three and nine months ended September 30, 2017, as their effect would have been anti-dilutive. Stock options to purchase 2,780,600 shares of common stock were excluded from the computation of diluted earnings per share during the three and nine months ended September 30, 2016, as their effect would have been anti-dilutive.