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Stock Authorization and Issuance
6 Months Ended
Jun. 30, 2022
Stock Authorization and Issuance [Abstract]  
Stock Authorization and Issuance 12. Stock Authorization and Issuance

Common Stock Warrants

As of June 30, 2022, we had outstanding warrants for the purchase of up to 10.3 million shares of our common stock. The estimated grant date fair value of these warrants of $3.2 million is included in additional paid-in capital in our condensed consolidated balance sheets. As of June 30, 2022, our outstanding warrants have an average exercise price of $0.75 per share and a weighted average remaining life of approximately 2.5 years.