Net product revenue for 2019 was $143.0 million, which included $137.2 million in the U.S. and $5.8 million inex- U.S. product revenues, respectively. This represents a 50 percent increase year-over-year compared to net product revenue of $95.4 million in 2018, all of which were in the U.S. For the full year ended December 31, 2019 the supply of free drug distributed to eligible patients was approximately 20 percent of the overall U.S. commercial supply compared to 26 percent in 2018. This represented $34.8 million in commercial value for the full year 2019, compared to $33.4 million for 2018.
Clovis had $296.7 million in cash, cash equivalents andavailable-for-sale securities as of December 31, 2019.
In August 2019, Clovis repurchased $190.3 million aggregate principal amount of its 2.50% convertible senior notes due 2021. Approximately $97.2 million aggregate principal amount of these notes remain outstanding.
In January 2020, Clovis repurchased $123.4 million aggregate principal amount of its 4.50% convertible senior notes due 2024 that were initially issued in August 2019. This transaction will save $28 million in cash on interest payments under the notes issued in August 2019, and approximately $140.0 million aggregate principal amount of these notes remain outstanding. Additionally, the Company has $300 million aggregate principal amount outstanding of its 1.25% convertible senior notes due 2025.
As of December 31, 2019, the Company had drawn approximately $35 million under the TPG ATHENA clinical trial financing and had up to $140 million available to draw under the agreement to fund the expenses of the ATHENA trial through Q3 2022.
Based on the Company’s anticipated revenues, spending, available financing sources and existing cash, cash equivalents andavailable-for-sale securities, the Company believes it has sufficient cash, cash equivalents andavailable-for-sale securities to fund its operating plan into the second half of 2021. This does not include any cash repayment that may be required to pay off (unless refinanced earlier) the remaining $97.2 million aggregate principal amount of the 2.50% convertible notes due 2021, at their maturity in September 2021.
Net cash used in operating activities was $70.1 million for Q4 2019 and $323.6 million for the full year 2019, compared with $82.7 million and $366.0 million for the comparable periods in 2018. Borrowings under the TPG ATHENA financing provided $13.8 million in Q4 2019, reducing net cash utilized in operating activities to $56.3 million in Q4 2019. Net cash used in operating activities for Q4 2019 included an upfront payment of $9.4 million to 3B Pharmaceuticals related to thein-licensing ofFAP-2286.
Net cash used in operating activities was $127.1 million for the second half of 2019, and $196.5 million for the first half of 2019, a reduction of $69.4 million or 35 percent. In addition, borrowings under the TPG ATHENA financing provided $8.6 million in the first half and $26.0 million in the second half of 2019, reducing net cash utilized in operating activities by $86.8 million, or 46 percent, from the first half to second half of 2019.
Clovis reported a net loss for Q4 2019 of $99.5 million, or ($1.81) per share, and $400.4 million, or a net loss of ($7.43) per share for the full year 2019. Net loss for Q4 2018 was $99.3 million, or ($1.88) per share, and $368.0 million, or a net loss of ($7.07) per share, for the full year 2018. Net loss for Q4 and the full year 2019 included share-based compensation expense of $12.6 million and $54.3 million, compared to $11.4 million and $49.1 million for the comparable periods of 2018.
Research and development expenses totaled $72.5 million for Q4 2019 and $283.1 million for the full year 2019, compared to $71.2 million and $231.3 million for the comparable periods in 2018. The increase for the full year is primarily due to higher research and development costs for rucaparib clinical trials.
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