pre_text: ITEM 6. SELECTED FINANCIAL DATA The selected financial data presented below has been derived from our audited consolidated financial statements. This data should be read in conjunction with “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Item 8. Financial Statements and Supplementary Data” of this Annual Report. (2) We retrospectively adopted ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” in 2018. As a result, we have adjusted balances for 2017 and 2016. We have not adjusted 2015 for ASU 2014-09. (3) On January 1, 2019, we adopted Accounting Standards Codification 842 “Leases” (“ASC 842”) using the modified retrospective method, reflecting any cumulative effect as an adjustment to equity. Results for reporting periods beginning on or after January 1, 2019 are presented under ASC 842, while prior period amounts were not adjusted and continue to be reported in accordance with the Company’s historical accounting under ASC 840 “Leases.”
table: December 31.
table: (in thousands) 2019 2018 2017 2016 2015
table: Consolidated Balance Sheet Data (2) (3):
table: Total cash, cash equivalents, and marketable securities $68,363 $207,423 $223,748 $133,761 $219,078
table: Goodwill $79,039 $72,858 $72,952 $73,164 $46,776
table: Total assets $984,812 $982,553 $1,012,753 $867,135 $627,758
table: Total stockholders’ equity $539,010 $621,531 $655,870 $548,940 $322,859
question: Analyse this data from a financial earnings document. What is the average total cash, cash equivalents, and marketable securities in 2015 and 2016?