Liquidity and Capital Resources
Since becoming a public company in 2015, we have financed our operations from several registered offerings and private placements of our securities, payments from license agreements, and U.S. and foreign government grants. From inception through August 12, 2021, we have raised a total of approximately $118.6 million from such sales of our equity and debt securities, both as a public company and prior to our IPO, as well as approximately $14.9 million in payments received under our license agreements and government grants and $0.278 million received pursuant to the Loan under the PPP, which was fully forgiven in April of 2021.
On January 3, 2020, we completed a registered direct offering for 500,000 shares of Common Stock with a purchase price of $10.00 per share. Our total net proceeds from the offering were approximately $4.5 million.
On January 6, 2021, we completed a private placement of 1,531,101 shares of Common Stock and warrants to purchase up to 1,531,101 shares of Common Stock to an affiliate of Armistice Capital, LLC, with a combined purchase price per share and warrant of $5.225. The total net proceeds from the private placement were approximately $8.0 million. The warrants have an exercise price of $5.225 per share, subject to adjustments as provided under the terms of the warrants, and will be exercisable on the six-month anniversary of their issuance date. The warrants are exercisable for five years from the issuance date.
On August 11, 2021, we completed a registered direct offering priced at-the-market under Nasdaq Rules for 4,668,844 shares of Common Stock with a purchase price of $2.3025 per share. We also completed a concurrent private placement of unregistered warrants to purchase up to an aggregate of 2,334,422 shares of Common Stock at an exercise price of $2.24 per share that are exercisable immediately upon issuance and will expire five and one-half years following the date of issuance. The total net proceeds to us from the offering were approximately $9.7 million.
At June 30, 2021, we had unrestricted cash and cash equivalents totaling $3.663 million.
The following table sets forth the primary uses of cash for the six months ended June 30, 2021 and 2020:
| | | | | | |
| | Six Months Ended June 30, |
| | 2021 | | 2020 |
Net Cash Used in Operating Activities | | $ | (5,207,425) | | $ | (3,867,415) |
Net Cash Used in Investing Activities | | $ | (63,865) | | $ | — |
Net Cash Provided by Financing Activities | | $ | 7,760,672 | | $ | 4,779,503 |
Comparison of Six Months Ended June 30, 2021 and 2020
Operating Activities. Net cash used in operating activities was $5.207 million for the six months ended June 30, 2021, compared to $3.867 million for the six months ended June 30, 2020. During the first six months of 2021, we recorded a net loss of $5.050 million, decreases in accounts payable and accrued expenses of $0.458 million, and an increase in tax credits receivable of $0.223 million, which was partially offset by stock-based compensation expense of $0.480 million. During the first six months of 2020, we recorded a net loss of $3.669 million, decreases in accounts payable and accrued expenses of $0.618 million, and a decrease in prepaid expenses and other current assets of $0.105 million. These decreases were partially offset by the expiration of a prepaid agreement of $0.160 million and stock-based compensation expense of $0.343 million.
Investing Activities. Net cash used in investing activities was $0.064 million for the six months ended June 30, 2021 as a result of the purchases of property and equipment related to our lab space.
Financing Activities. Net cash provided by financing activities was $7.761 million for the six months ended June 30, 2021, compared to $4.780 million for the six months ended June 30, 2020. During the six months ended June 30, 2021, we received net proceeds of $7.989 million from the completion of a private placement, which was partially offset by full forgiveness of the Loan under the PPP in the amount of $0.278 million. During the six months ended June 30, 2020, we received net proceeds of $4.501 million from the completion of a registered direct stock offering and $0.278 million of Loan funds from the PPP.