Operating loss for the second quarter of 2019 was $7.3 million, compared to an operating loss of $17.0 million for the second quarter of 2018, a decrease of $9.7 million, or 57%. Total other expenses, net, for the second quarter of 2019 were $2.3 million, compared to $3.0 million for the second quarter of 2018, a decrease of $0.7 million, or 22%. The decrease was driven primarily by a decrease in interest expense and decrease in the change in fair value of warrant liability.
Net loss for the second quarter of 2019 was $9.6 million, or $0.11 per share, compared to a net loss of $20.0 million, or $0.30 per share, for the second quarter of 2018, a decrease of $10.4 million, or 52%.
As of June 30, 2019, the Company had $20.0 million in cash and $90.2 million in debt obligations, of which $17.1 million were capital lease obligations, compared to $21.3 million in cash and $59.3 million in debt obligations, of which $17.7 million were capital lease obligations, as of December 31, 2018.
First Half 2019 Results:
Net revenue for the six months ended June 30, 2019 was $122.1 million, compared to $79.1 million for the first six months of 2018, an increase of $43.0 million, or 54%. The increase in net revenue was driven by a $36.9 million increase, or 56%, in net revenue of Advanced Wound Care products and a $6.0 million increase, or 47%, in net revenue of Surgical & Sports Medicine products compared to the prior year. Net revenue of PuraPly products for the six months ended June 30, 2019 were $55.1 million, compared to $23.4 million for the first six months of 2018, an increase of $31.8 million, or 136%. Net revenue of PuraPly products represented approximately 45% of net revenue for the six months ended June 30, 2019, compared to 30% for the first six months of 2018.
Gross profit for the six months ended June 30, 2019 was $85.6 million or 70% of net revenue, compared to $47.3 million, or 60% of net revenue, for the first six months of 2018, an increase of $38.4 million, or 81%. The largest contributors to the increase in gross margin from the year earlier period were increased sales volume due to the strength in our Advanced Wound Care products, PuraPly regaining pass-through reimbursement status for the2-year period effective October 1, 2018, and incremental revenue from our Surgical & Sports Medicine products as a result of our NuTech Medical acquisition and the resulting higher margins realized as a result of manufacturing efficiencies associated with our Advanced Wound Care products.
Operating expenses for the six months ended June 30, 2019 were $105.1 million, compared to $84.3 million for the first six months of 2018, an increase of $20.8 million, or 25%. The increase in operating expenses in 2019 as compared to 2018 was driven primarily by higher selling, general and administrative expenses which increased to $97.9 million, compared to $75.9 million in 2018, an increase of $22.0 million, or 29%. The increase in selling, general and administrative expenses is primarily due to additional headcount, primarily in our direct sales force, higher legal, consulting fees and other costs associated with the ongoing operations of our business, and additional amortization associated with the intangible assets from the NuTech Medical acquisition attributable to the higher expected consumption of the related intangible assets’ economic benefits. Operating expenses for the six months ended June 30, 2019 were also impacted by higher R&D expense which was $7.2 million, compared to $4.9 million for the first six months of 2018, an increase of $2.4 million, or 49%.
Operating loss for the six months ended June 30, 2019 was $19.4 million, compared to an operating loss of $37.0 million for the first six months of 2018, a decrease of $17.6 million, or 47%. Total other expenses for the six