Selling, Marketing, General, and Administrative. Selling, marketing, general and administrative expenses were $2,021 and $3,872 for the three and six months ended June 30, 2014, respectively, compared to $1,209 and $2,523 for the three and six months ended June 30, 2013, respectively. The increase in expense for both the three and six month periods is due to additional legal costs incurred in conjunction with the arbitration proceeding and settlement discussions with Visser, increases in stock based compensation related to 2014 stock option grants, and additional payroll expenses associated with the hiring of our Vice President of Worldwide Sales and Support.