Table of Contents COHERENT, INC. AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued) 8. GOODWILL AND INTANGIBLE ASSETS (Continued) For both the OLS and ILS reporting units, we elected to bypass the qualitative assessment in fiscal 2019 and proceed directly to performing the goodwill impairment test. We performed our test using the opening balance sheet as of the first day of the fourth quarter of fiscal 2019 and noted no impairment. We determined the fair value of the OLS and ILS reporting units for the test using a 50-50% weighting of the Income (discounted cash flow) approach and Market (market comparable) approach. Management completed and reviewed the results of the impairment analysis and concluded that an impairment charge was not required as the estimated fair value of both the OLS and ILS reporting units was significantly in excess of their carrying values. Between the completion of our assessment and the end of the fourth quarter of fiscal 2019, we noted no indications of impairment or triggering events with either reporting unit to cause us to review goodwill for potential impairment. The changes in the carrying amount of goodwill by segment for fiscal 2019 and 2018 are as follows (in thousands): (1) Gross amount of goodwill for our ILS segment was $343.3 million at September 28, 2019 and $355.2 million at September 29, 2018, respectively. At both September 28, 2019 and September 29, 2018, the accumulated impairment loss for the ILS reporting unit was $13.0 million reflecting an impairment charge in fiscal 2009. (2) Gross amount of goodwill for our OLS segment was $105.5 million and $109.5 million at September 28, 2019 and September 29, 2018, respectively. At both September 28, 2019 and September 29, 2018, the accumulated impairment loss for the OLS reporting unit was $8.7 million reflecting impairment charges in fiscal 2003 and fiscal 2009. Industrial Lasers & Systems (1) OEM Laser Sources (2) Total Balance as of September 30, 2017 $ 315,516 $ 102,178 $ 417,694 Additions (see Note 4) 31,456 — 31,456 Translation adjustments (4,764 ) (1,446 ) (6,210 ) Balance as of September 29, 2018 342,208 100,732 442,940 Additions (see Note 4) 3,333 — 3,333 Translation adjustments (15,260) (3,912) (19,172) Balance as of September 28, 2019 $ 330,281 $ 96,820 $ 427,101 We evaluate long-lived assets and amortizable intangible assets whenever events or changes in business circumstances or our planned use of assets indicate that their carrying amounts may not be fully recoverable or that their useful lives are no longer appropriate. Reviews are performed to determine whether the carrying values of assets are impaired based on comparison to the undiscounted expected future cash flows identifiable to such long-lived and amortizable intangible assets. If the comparison indicates that impairment exists, the impaired asset is written down to its fair value. In fiscal 2019 and 2018, we did not have any impairment of intangible assets as a result of the impairment analysis. The components of our amortizable intangible assets are as follows (in thousands): For accounting purposes, when an intangible asset is fully amortized, it is removed from the disclosure schedule. During the third quarter of fiscal 2019, in conjunction with our decision to co-locate the manufacturing and engineering of our HPFL products at our Hamburg, Germany, facility to our Tampere, Finland, location and exit a portion of our HPFL 95 Fiscal year-end 2019 Fiscal year-end 2018 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Existing technology $ 193,704 $ (131,429 ) $ 62,275 $ 201,759 $ (94,376 ) $ 107,383 Customer relationships 42,083 (21,512) 20,571 50,359 (22,383) 27,976 Trade name 5,261 (5,138 ) 123 5,888 (3,818 ) 2,070 Production know-how 2,300 (456) 1,844 — — — In-process research and development — — — 4,864 — 4,864 Total $ 243,348 $ (158,535) $ 84,813 $ 262,870 $ (120,577) $ 142,293