Nothing to hide, they have been frank about accounting errors and they have been corrected. Early ineptitude of accountants would be a GOOD REASON for replacing them. E&Y wasn't paying enough attention to them, a GOOD REASON for replacing them.
Now tell me what other company has implemented disruptive technology within a two year time span without the "help" of vulture capital.
Based on the fact that the company voluntarily dealt with the issue at hand in a restatement a year ago, I see nothing to be suspicious about it. lol They hired a top 30 audit firm to go over their k with a fine tooth comb.