| Summary of available for sale securities |
|
|
|
As of December 31, 2016
|
|
|
|
|
Cost
|
|
Gross
Unrealized
Gains
|
|
Gross
Unrealized
Losses
|
|
Fair
Value
|
|
|
Corporate bonds:
|
|
|
|
|
|
|
|
|
|
|
U.S. corporations
|
|
$
|
6,814,295
|
|
$
|
385
|
|
$
|
52,072
|
|
$
|
6,762,608
|
|
|
International corporations
|
|
1,211,645
|
|
2,241
|
|
10,973
|
|
1,202,913
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$
|
8,025,940
|
|
$
|
2,626
|
|
$
|
63,045
|
|
$
|
7,965,521
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
As of December 31, 2015
|
|
|
|
|
Cost
|
|
Gross
Unrealized
Gains
|
|
Gross
Unrealized
Losses
|
|
Fair
Value
|
|
|
Corporate bonds:
|
|
|
|
|
|
|
|
|
|
|
U.S. corporations
|
|
$
|
6,176,341
|
|
$
|
—
|
|
$
|
68,381
|
|
$
|
6,107,960
|
|
|
International corporations
|
|
1,515,200
|
|
—
|
|
20,956
|
|
1,494,244
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$
|
7,691,541
|
|
$
|
—
|
|
$
|
89,337
|
|
$
|
7,602,204
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Scheduled maturities of investments |
As of December 31, 2016, the scheduled maturities of our investments are as follows:
|
|
|
Cost
|
|
Fair Value
|
|
|
Less than 1 year
|
|
$
|
2,503,313
|
|
$
|
2,495,449
|
|
|
1 to 3 years
|
|
4,901,553
|
|
4,863,174
|
|
|
3 to 5 years
|
|
621,074
|
|
606,898
|
|
|
|
|
|
|
|
|
|
Total
|
|
$
|
8,025,940
|
|
$
|
7,965,521
|
|
|
|
|
|
|
|
|
|
|
|