best interests of our employees, customers, suppliers, and stakeholders, or as required by federal, state, or local authorities. It is not clear what the potential effects of such alterations or modifications may have on our business, consolidated results of operations, financial condition, and liquidity.
First Amendment to TRGP Agreement
On January 23, 2020, we entered into the first amendment to the investment agreement dated May 3, 2017 with TR Global Funding V, LLC (“TRGP”) (“TRGP Agreement”) to amend the recovery sharing formula related to claims against SK hynix, Inc. a South Korean memory semiconductor supplier (“SK hynix”), for alleged infringement of our patents. The TRGP Agreement generally provided that TRGP directly fund the costs incurred by us or on our behalf in connection with our first ITC action and certain U.S. district court proceedings against SK hynix.
Amendment to SVB Credit Agreement
On February 27, 2020, we entered into an amendment to a credit agreement dated October 31, 2009 with Silicon Valley Bank (“SVB”) (as the same may from time to time be amended, modified, supplemented or restated, the “SVB Credit Agreement”) to extend the maturity date of the borrowings under the SVB Credit Agreement from March 30, 2020 to April 30, 2021.
2019 Lincoln Park Purchase Agreement
On June 24, 2019, we entered into a purchase agreement (the “2019 Purchase Agreement”) with Lincoln Park Capital Fund, LLC (“Lincoln Park”), pursuant to which we have the right to sell to Lincoln Park up to an aggregate of $10 million in shares of our common stock over the 36-month term of the 2019 Purchase Agreement subject to the conditions and limitations set forth in the 2019 Purchase Agreement. During 2020, Lincoln Park did not purchase shares of our common stock under the 2019 Purchase Agreement. Subsequent to January 2, 2021, Lincoln Park purchased an aggregate of 1,669,429 shares of our common stock for a net purchase price of $1.6 million under the 2019 Purchase Agreement. In connection with the purchases, we issued to Lincoln Park an aggregate of 129,468 shares of our common stock as commitment shares in noncash transactions.
2020 Lincoln Park Purchase Agreement
On March 5, 2020, we entered into another purchase agreement (the “2020 Purchase Agreement”) with Lincoln Park, pursuant to which we had the right to sell to Lincoln Park up to an aggregate of $20 million in shares of our common stock over the 36-month term of the 2020 Purchase Agreement subject to the conditions and limitations set forth in the 2020 Purchase Agreement. As consideration for entering into the 2020 Purchase Agreement, we issued to Lincoln Park 1,529,052 shares of our common stock as initial commitment shares in a noncash transaction on March 6, 2020 and would issue up to 917,431 additional shares of our common stock as additional commitment shares on a pro rata basis in connection with any additional purchases. We would not receive any cash proceeds from the issuance of these additional commitment shares.
During 2020, Lincoln Park purchased an aggregate of 23,400,122 shares of our common stock for a net purchase price of $12.2 million under the 2020 Purchase Agreement. In connection with the purchases, during 2020, we issued to Lincoln Park an aggregate of 560,588 shares of our common stock as commitment shares in noncash transactions. Subsequent to January 2, 2021, Lincoln Park purchased an aggregate of 9,544,595 shares of our common stock for a net purchase price of $7.8 million under the 2020 Purchase Agreement. In connection with the purchases, we issued to Lincoln Park an aggregate of 356,843 shares of our common stock as commitment shares in noncash transactions. In February 2021, we completed the sales under the 2020 Purchase Agreement.
Paycheck Protection Program Loan
On April 23, 2020, we entered into an unsecured promissory note with a principal amount of $0.6 million through Hanmi Bank under the Paycheck Protection Program (“PPP”) (“PPP Loan”) administered by the Small Business Administration (“SBA”) and established as part of the Coronavirus Aid, Relief, and Economic Security Act (“CARES