Marketable securities with remaining maturities less than one year are classified as short-term, and those with remaining maturities greater than one year are classified as long-term. The fair value of our marketable securities as of June 30, 2015, by maturity, were as follows:

 
     As of June 30 and March 31, 2015, our marketable securities were as follows:
 

 

 
     The following table shows the gross unrealized losses and fair value of our investments with unrealized losses, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position as of June 30 and March 31, 2015:
 

 
     Gross unrealized losses totaled $36,779 as of June 30, 2015, and were attributed to six corporate bonds out of a portfolio of 30 bonds. The gross unrealized losses were due to market-price decreases after the bonds were purchased.

     All of the bonds we held had investment-grade credit ratings by Moody’s or Standard and Poor’s. For each bond with an unrealized loss, we expect to recover the entire cost basis of each security based on our consideration of factors including their credit ratings, the underlying ratings of insured bonds, and historical default rates for securities of comparable credit rating.

     One corporate bond, with a fair market value of $2,595,544, had been in continuous unrealized loss positions for 12 months or greater. For this security, we also considered the severity of unrealized loss, which was less than 1% of adjusted cost.

     Because we expect to recover the cost basis of investments held, we do not consider any of our marketable securities to be other-than-temporarily impaired at June 30, 2015.