Gross Profit Percentage, Net Product Sales
Gross profit percentage from net product sales was 76% and 74% in the 2023 and 2022 periods, respectively, primarily reflecting lower royalty expense, inclusive of contingent earn out obligations.
Selling, General and Administrative Expenses
Selling, general and administrative expenses decreased by $6.3 million to $13.9 million in the three months ended June 30, 2023, as compared to $20.2 million in the three months ended June 30, 2022. The year over year decrease in selling, general and administrative expenses was primarily driven by (i) $4.2 million in lower net compensation and training costs primarily relating to the absence of an eye care salesforce in the 2023 period, (ii) $0.9 million in lower insurance, rent, legal and other professional fees, (iii) $0.8 million in lower share-based compensation, and (iv) $0.2 million in lower marketing expenses for Upneeq.
Selling, general and administrative expenses include various restructuring related expenditures, including severance, of $1.9 million in the three months ended June 30, 2022 and non-cash share-based compensation expenses of $0.2 million and $1.0 million, in the three months ended June 30, 2023 and 2022, respectively. Refer to Notes 14, “Restructuring Expenses,” and 8, “Share-Based Compensation,” of our unaudited condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q.
Research and Development Expenses
The following table summarizes our research and development (“R&D”) expenses incurred for the periods indicated (dollars in thousands):
| | | | | | | | | |
| | Three Months Ended June 30, | | | |
| | 2023 | | 2022 | | % Change | |
Arbaclofen ER | | $ | — | | $ | 86 | | (100) | % |
RVL-1201 (Upneeq) | | | 16 | | | 183 | | (91) | % |
Other research and development | | | 531 | | | 907 | | (41) | % |
Total research and development expenses | | $ | 547 | | $ | 1,176 | | (53) | % |
R&D expenses decreased by $0.7 million to $0.5 million in the three months ended June 30, 2023, as compared to $1.2 million in the three months ended June 30, 2022. The year over year decrease in R&D expenses primarily reflects $0.3 million in lower project spending and $0.2 million in lower share-based compensation expense.
R&D expenses include non-cash share-based compensation expenses of less than $0.1 million and $0.2 million in the three months ended June 30, 2023 and 2022, respectively.
Impairment of Intangible Asset
During the three months ended June 30, 2023 and following our discontinuance of marketing efforts associated with arbaclofen ER, an In-Process Research and Development project-based intangible asset, we recognized impairment charges of $13.9 million. No such impairments were recognized in the three months ended June 30, 2022.
Refer to Note 15, “Indefinite-Lived Intangible Assets,” of our unaudited condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q for additional information on our current year impairment.
Interest Expense and Amortization of Debt Discount
Interest expense and amortization of debt discount decreased by $1.0 million to less than $0.1 million in the three months ended June 30, 2023, as compared to $1.0 million in the three months ended June 30, 2022, as a result of our recognition of $0.9 million of amortization expense from the second tranche financial commitment asset, particular to the 2022 period.