5. Available-for-Sale Securities

As of September 30, 2016, available-for-sale securities consisted of the following (in thousands):

 

 

As of December 31, 2015, available-for-sale securities consisted of the following (in thousands):

 

 

As of September 30, 2016, there were no available-for-sale securities that have been in a continuous unrealized loss position for less than 12 months.

 

As of December 31, 2015, the fair value and gross unrealized losses of available-for-sale securities that have been in a continuous unrealized loss position for less than 12 months were as follows (in thousands):

 

As of September 30, 2016, the amortized cost and fair value of available-for-sale securities by contractual maturity were (in thousands):