Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity

Stockholders' Equity
3 Months Ended
Mar. 31, 2021
Stockholders' Equity Attributable to Parent [Abstract]  
Stockholders' Equity Stockholders’ Equity
Common Stock
Total common stock authorized to be issued as of March 31, 2021 was 1,000,000,000 shares, with a par value of $0.0001 per share. At March 31, 2021 and December 31, 2020, there were 71,211,399 and 56,380,111 shares outstanding, respectively, inclusive of 574 restricted shares subject to repurchase for unvested shares related to early option exercises under the Company’s stock equity plans.
On August 14, 2020, we entered into an At-The-Market Issuance Sales Agreement (the “Sales Agreement”) with Ascendiant Capital Markets, LLC (“Ascendiant”), as sales agent, pursuant to which the Company would offer and sell, from time to time, through Ascendiant shares of common stock for an aggregate offering price of up to $15,000. In January 2021, we issued 2,670,121 shares of our common stock were sold for aggregate net cash proceeds of $5,058. Transaction costs were $156. We terminated the Sales Agreement with Ascendiant effective as of March 28, 2021.
In February 2021, we entered into an underwriting agreement with Northland Securities, Inc. and Roth Capital Partners, LLC, relating to an underwritten public offering to which we issued 11,761,111 shares of our common stock at an
offering price of $2.25 per share. Aggregate cash proceeds at closing, net of transaction costs of $1,740, totaled $24,722. We incurred additional transaction costs paid outside of closing of $75.
We have various warrants outstanding. A summary of our outstanding warrants as of March 31, 2021 and December 31, 2020 is set forth below:

Warrant Type Cash Exercise
Price per
Warrants Outstanding
2020 Convertible Note warrants $ 2.25  2,160,000 
Common stock warrant (Series D-1) $ 5.54  14,866 
Common stock warrants (Series F) $ 9.22  377,402 
Public Warrants (PHUNW) $ 11.50  1,761,291 
Private Placement Warrants $ 11.50  1,658,381 
Unit Purchase Option Warrants $ 11.50  24,172 
Total 5,996,112