Disaggregation of Revenues, Geographic Sales and Product Sales (Details 2) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 29, 2018 |
Jun. 30, 2017 |
Jun. 29, 2018 |
Jun. 30, 2017 |
|
| Product Information [Line Items] | ||||
| Revenue from Contract with Customer, Including Assessed Tax | $ 6,613 | $ 5,619 | $ 12,548 | $ 10,698 |
| Net sales | 33,905 | 21,936 | 60,998 | 42,286 |
| ICLs [Member] | ||||
| Product Information [Line Items] | ||||
| Revenue from Contract with Customer, Including Assessed Tax | 27,292 | 16,317 | 48,450 | 31,588 |
| IOLs [Member] | ||||
| Product Information [Line Items] | ||||
| Revenue from Contract with Customer, Including Assessed Tax | 4,186 | 4,377 | 8,244 | 8,983 |
| Other surgical products [Member] | ||||
| Product Information [Line Items] | ||||
| Revenue from Contract with Customer, Including Assessed Tax | $ 2,427 | $ 1,242 | $ 4,304 | $ 1,715 |