| | one in patients with painful DPN and one in patients with fibromyalgia – which offset the completion of our initial Phase 2 clinical studies in these indications in 2019. |
General and administrative expenses
General and administrative expenses were $14.7 million for the nine months ended September 30, 2020, compared to $14.4 million for the nine months ended September 30, 2019. The increase of $0.3 million was due to a $1.6 million increase related to employee non-cash stock based-compensation expenses and insurance costs to support ongoing business operations offset by a decrease of $1.3 million related to reduced employee headcount, professional fees, and patent costs.
Other income
We recorded $0.6 million of other income for the nine months ended September 30, 2020, compared to $1.8 million for the nine months ended September 30, 2019. This decrease was primarily driven by a decrease in interest income earned on our cash and cash equivalents.
Liquidity and capital resources
From our inception through September 30, 2020, we have incurred significant operating losses and have funded our operations to date through proceeds from collaborations, grants, sales of convertible preferred stock, IPO and follow-on public offering and our ATM Offering. We have generated limited revenue to date from a research collaboration agreement with Allergan, a development services agreement with Allergan, and research and development grants from the U.S. government. The jointly funded research activities under the research collaboration agreement with Allergan, as well as associated payments by Allergan to us, came to their contractual conclusion in accordance with the agreement in the third quarter of 2020.
On June 25, 2018, we completed our IPO, pursuant to which we issued and sold 7,359,998 shares of our common stock at a price of $16.00 per share, which included 959,999 shares sold pursuant to the exercise of the underwriters’ option to purchase additional shares. We received $106.5 million of proceeds, net of underwriting discounts and commissions and other offering expenses.
On July 1, 2019, we entered into a Sales Agreement, or the Sales Agreement, with Cowen and Company, LLC, or Cowen, pursuant to which we may issue and sell, from time to time, shares of our common stock having an aggregate offering price of up to $50.0 million through Cowen as sales agent. Cowen may sell common stock by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415(a)(4) of the Securities Act, including sales made directly on or through the Nasdaq Global Select Market or any other existing trade market for the common stock, in negotiated transactions at market prices prevailing at the time of sale or at prices related to prevailing market prices, or any other method permitted by law. Cowen will be entitled to receive 3.0% of the gross sales price per share of common stock sold under the Sales Agreement. During the nine months ended September 30, 2020, 1,491,482 shares of common stock have been issued and sold pursuant to the Sales Agreement at a weighted-average price of $3.89 per share. During the nine months ended September 30, 2020, we received $5.7 million of net proceeds after deducting sales commissions and other offering expenses.
On January 14, 2020, we completed a follow-on public offering of our common stock pursuant to an effective registration statement on Form S-3. We sold an aggregate of 11,691,666 shares of common stock, which included the exercise in full of the underwriters’ option to purchase additional shares, at a public offering price of $3.00 per share. Net proceeds from the offering were approximately $33.3 million after deducting underwriting discounts and commissions as well as other offering expenses.
On October 26, 2020, we completed a follow-on public offering of its common stock pursuant to an effective registration statement on Form S-3. We sold an aggregate of 16,100,000 shares of common stock, which included the exercise in full of the underwriters’ option to purchase additional shares, at a public offering price of $3.00 per share. Net proceeds from