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Cost of services increased by $65.0 million, or 54%, from $119.6 million for the year ended December 31, 2019 to $184.6 million for the year ended December 31, 2020. The increase was primarily attributable to the following cost components: a $17.0 million increase in reagents and laboratory supplies expense due primarily to the 131% increase in accessioned volumes coupled with the lower per test cost of performing COVID-19 tests relative to our other tests; a $13.2 million increase in stock-based compensation expenses primarily driven by the increase in fair value of the liability-classified awards; an $11.8 million increase in personnel-related expenses driven by an increase in average headcount, partially offset by COVID-19 austerity measures; a $6.4 million increase in third party reference laboratory expenses due to an increase in tests performed by such third parties; a $4.4 million increase in expenses for other services such as genetic counseling, shipping and phlebotomy services; a $4.3 million increase in depreciation and amortization expenses driven by laboratory sequencing equipment acquired in 2020 and an increase in capitalized software as compared to the prior year; a $3.7 million increase in outside labor costs driven by temporary hires contracted in 2020 to perform COVID-19 testing activities as well as an increase in consultants supporting collaboration services; a $1.6 million increase in software expenses due to increased cloud storage and expanded computing capacity requirements for testing data; and a $1.3 million increase in equipment-related expenses, including maintenance expenses on existing equipment and purchases of minor equipment in 2020.