| | December 31, | | ||||
| | 2016 | | 2015 | | ||
Raw materials | | $ | 15,007 | | $ | 15,653 | |
Work in process | | | 10,852 | | | 14,222 | |
Finished goods | | | 42,191 | | | 35,695 | |
Balance at end of year | | $ | 68,050 | | $ | 65,570 | |