Product sold through June 30, 2020 generally consisted of drug product that was previously charged to research and development expense prior to FDA approval of CAPLYTA. Because the Company previously expensed drug product, the cost of drug product sold is lower than it would have been and has a positive impact on our cost of product sales and related product gross margins for the three and six months ended June 30, 2020. The Company’s reported cost of product sales as a percentage of product sales, net was 6.9% or approximately $129,000 for the three months ended June 30, 2020, and was 7.2% or approximately $198,000 for the six months ended June 30, 2020. Had direct and overhead costs not been previously recognized into research and development expense, the percentage would have been 10.4% or approximately $195,000 for the three months ended June 30, 2020 and 11.8% or approximately $325,000 for the six months ended June 30, 2020.
We expect that research and development expenses will increase moderately as we proceed with our Phase
3
clinical trials of
lumateperone
for the treatment of bipolar depression and depressive disorders, other clinical trials, increased manufacturing of drug product for clinical trials and
pre-clinical
development activities. We also expect that our
general and administrative costs will increase from prior periods primarily due to costs associated with building
and maintaining
infrastructure
and promotional activities
to support the commercial sales of CAPLYTA, which will include hiring additional personnel
and
increasing technological capabilities. On September
28
,
2018
, we signed a lease with a related party to acquire
15,534
square feet of additional office space in our current headquarters facility. We granted options to purchase
1,833,102
shares of our common stock in
2019
and have granted options to purchase an additional
782,237
shares of our common stock in the six months ended June
30
,
2020
. We also granted time based restricted stock units, or RSUs, for
950,449
shares of our common stock in
2019
and time based RSUs for
1,003,006
shares of our common stock in the six months ended June
30
,
2020
. We will recognize expense associated with these RSUs and options over three years in both research and development expenses and general and administrative expenses. In the first quarter of
2017
, we also granted performance based RSUs, which vest based on the achievement of certain milestones that include (i) the submission of an NDA with the FDA, (ii) the approval of the NDA by the FDA, or the Milestone RSUs, and (iii) the achievement of certain comparative shareholder returns against our peers, or the TSR RSUs. The Milestone RSUs were valued at the closing price on March
8
,
2017
. The RSUs related to the NDA submission were amortized through December
31
,
2018
based on the probable vesting date. The NDA submission milestone was achieved in the third quarter of
2018
. The Milestone RSUs related to the NDA submission vested on December
31
,
2018
. The NDA approval milestone was achieved in the fourth quarter of
2019
. The Milestone RSUs related to the NDA approval vested on December
31
,
2019
. The TSR RSUs were valued using the Monte Carlo simulation method and were amortized over the life of the RSU’s which vested on January
24
,
2020
. In the first quarter of
2020
, we also granted performance based RSUs, which vest based on the achievement of certain milestones that include (i) the approval of a planned NDA by the FDA, or the
2020
Milestone RSUs, and (ii) the achievement of certain comparative shareholder returns against our peers, or the
2020
TSR RSUs. The
2020
Milestone RSUs were valued at the closing price on February
18
,
2020
. The
2020
TSR RSUs were valued using the Monte Carlo simulation method. We expect to continue to grant stock options and other stock-based awards in the future, which with our growing employee base will increase our stock-based compensation expense in future periods.