General and Administrative Expense
For the three months ended June 30, 2021, the decrease in general and administrative expenses of $0.7 million as compared to the three months ended June 30, 2020, primarily consisted of a decrease of $0.4 million in professional service costs and a decrease of $0.3 million in personnel and related costs.
For the six months ended June 30, 2021, the decrease in general and administrative expenses of $0.6 million as compared to the six months ended June 30, 2020, primarily consisted of a decrease of $0.5 million in personnel and related costs and a decrease of $0.1 million in professional service costs.
Interest Income and Other Expense, net
For the three months ended June 30, 2021, the decrease in interest income and other expense, net of $0.2 million as compared to the three months ended June 30, 2020, primarily consisted of a decrease in interest income earned due to a decrease in interest rates.
For the six months ended June 30, 2021, the decrease in interest income and other expense, net of $0.5 million as compared to the six months ended June 30, 2020, primarily consisted of a decrease in interest income earned due to a decrease in interest rates.
Loss from equity method investment
For the three months ended June 30, 2021, the loss from equity method investment of $0.5 million represents our share of Angel Pharmaceutical’s loss for the period.
For the six months ended June 30, 2021, the loss from equity method investment of $0.6 million represents our share of Angel Pharmaceutical’s loss for the period.
Liquidity and Capital Resources
As of June 30, 2021, we had cash, cash equivalents and marketable securities of $66.5 million, and an accumulated deficit of $246.5 million, compared to cash and cash equivalents and marketable securities of $44.3 million and an accumulated deficit of $223.1 million as of December 31, 2020. We have financed our operations primarily through private placements of convertible preferred stock and the sale of common stock.
In March 2016, we consummated our IPO and sold 4,700,000 shares of our common stock at a price of $15.00 per share, and in April 2016, sold 502,618 shares at a price of $15.00 per share pursuant to the partial exercise of the underwriters’ option to purchase additional shares of common stock. We received net proceeds of approximately $70.6 million, after deducting underwriting discounts, commissions and offering expenses. Immediately prior to the consummation of our IPO, all outstanding shares of the convertible preferred stock were converted into common stock on a one-for-one basis.
In March 2018, in a follow-on offering, we sold 8,117,647 shares of our common stock at a price of $8.50 per share, which included 1,058,823 shares issued pursuant to the underwriters’ exercise of their option to purchase additional shares of common stock. We received aggregate net proceeds of approximately $64.9 million, after underwriting discounts, commissions and offering expenses.
In February 2021, we completed a follow-on public offering in which we sold 9,783,660 shares of common stock at a price of $3.50 per share, which included 1,212,231 shares issued pursuant to the underwriters’ exercise of their option to purchase additional shares of common stock. We received aggregate net proceeds of approximately $32.0 million, net of underwriting discounts and commissions and offering expenses.