| | December 31, | | |||||||
| | 2017 | | 2016 | | 2015 | | |||
Financial assets | | | | | | | | | | |
Cash and cash equivalents | | $ | 16,112,268 | | | 14,681,204 | | | 14,046,262 | |
Investment in securities at fair value through profit or loss | | | 1,127,841 | | | 970,292 | | | 1, 242,614 | |
Investments held to maturity | | | 64,629 | | | 65,509 | | | 52,572 | |
Accounts receivable | | | 2,599,208 | | | 2,524,942 | | | 1,862,250 | |
Due from related parties | | | 326 | | | 148,855 | | | 194,522 | |
Long-term receivables | | | 162,337 | | | 161,690 | | | 128,169 | |
Derivative financial instruments | | | - | | | 8,308 | | | 1,244 | |
| | | | | | | | | | |
Financial liabilities | | | | | | | | | | |
Financial debt | | $ | (5,249,024) | | | (4,047,937) | | | (4,127,010) | |
Trade payables, sundry creditors and expenses payable | | | (4,163,443) | | | (4,095,089) | | | (4,088,989) | |
Due to related parties | | | (55,252) | | | (189,966) | | | (165,628) | |
Derivative financial instruments | | | (6,821) | | | - | | | - | |