At December 31, | ||||||||||||
2015 | 2016 | 2017 | ||||||||||
(in thousands) | ||||||||||||
Trade receivables | $ | 16,345 | $ | 14,427 | $ | 18,754 | ||||||
Unbilled revenue | 740 | 1,624 | 3,467 | |||||||||
Unissued credit notes | — | (138 | ) | (485 | ) | |||||||
Provisions on trade receivables | (588 | ) | (628 | ) | (810 | ) | ||||||
Net trade receivables | $ | 16,497 | $ | 15,285 | $ | 20,926 |
December 31, | ||||||||||||
2015 | 2016 | 2017 | ||||||||||
(in thousands) | ||||||||||||
At January 1, | $ | 1,965 | $ | 588 | $ | 628 | ||||||
Charge for the year | 15 | 40 | 182 | |||||||||
Utilized amounts | (1,392 | ) | — | — | ||||||||
At year end | $ | 588 | $ | 628 | $ | 810 |
Total | Neither past due nor Impaired | Past due but not impaired | ||||||||||||||||||||||
<30 days | 30-60 days | 60-120 days | >120 days | |||||||||||||||||||||
(in thousands) | ||||||||||||||||||||||||
At December 31, 2015 | $ | 16,497 | $ | 12,589 | $ | 3,520 | $ | 138 | $ | 250 | $ | — | ||||||||||||
At December 31, 2016 | $ | 15,285 | $ | 12,995 | $ | 412 | $ | 374 | $ | 1,494 | $ | 10 | ||||||||||||
At December 31, 2017 | $ | 20,926 | $ | 12,746 | $ | 4,771 | $ | 1,036 | $ | 1,673 | $ | 700 |