The adoption of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), represented a change in revenue for the year ended December 31, 2019 of approximately $ as this adoption resulted in an acceleration of revenue recognition related to certain genomic test results delivered to Medicare but not recognized as revenue under ASC Topic 605 until certain documentation requirements were met.
Cost of Revenue. Cost of revenue increased $ million, or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Research and Development Expense. Research and development expense increased $ million, or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Sales and Marketing Expense. Sales and marketing expense increased $ million, or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
General and Administrative Expense. General and administrative expense increased $ million, or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Legal Settlement. Legal settlement decreased $ million, or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Interest Income. Interest income increased $ , or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Interest Expense on Long-Term Debt – Related Party. Interest expense on long-term debt – related party increased $ million, or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Interest Expense and Settlement of Convertible Promissory Notes. Interest expense increased $ million, or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Revaluation of Warrants and Embedded Derivative Liabilities. Revaluation of warrants and embedded derivative liabilities increased $ , or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Other Income (Expense). Other income (expense) increased $ , or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Income Tax Expense. Income tax expense increased $ , or %, for the year ended December 31, 2019 compared to the year ended December 31, 2018. This increase was primarily due to .
Quarterly Results of Operations
The following table sets forth selected unaudited consolidated quarterly data for each of the quarters in fiscal year 2019. In our opinion, the following selected unaudited consolidated quarterly statements of operations data have been prepared on the same basis, except for the effect of adopting ASC Topic 606, as the audited consolidated financial statements included elsewhere in this prospectus and reflect all necessary adjustments,
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