9.     Cash, Cash Equivalents and Available-For-Sale Securities

Cash, cash equivalents and available-for-sale securities consisted of the following (in thousands):

Cash equivalents and available-for-sale securities include the following securities with unrealized gains and losses (in thousands):

As of March 31, 2013, the contractual maturities of our cash equivalents and available-for-sale securities were (in thousands):

As of March 31, 2013, our cash equivalents and available-for-sale securities had a weighted average time to maturity of 214 days. We view our available-for-sale portfolio as available for use in current operations.  Accordingly, we have classified certain investments as available-for-sale securities on our balance sheet even though the stated maturity date of these securities may be more than one year from the current balance sheet date. We have the ability to hold all investments as of March 31, 2013 to maturity. At March 31, 2013 and December 31, 2012, we had no investments that had been in a continuous unrealized loss position for more than 12 months.  As of March 31, 2013, a total of 24 individual securities had been in an unrealized loss position for 12 months or less and the losses were determined to be temporary.

The following table shows the fair value and gross unrealized losses of our investments in individual securities that are in an unrealized loss position, aggregated by investment category (in thousands):