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Stockholders' Equity
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Stockholders' Equity

9.

Stockholders’ Equity

2019 Common Stock Offering

In October 2019, we sold 9.9 million shares of our common stock at a public offering price of $17.50 per share. We received total net cash proceeds of $162.2 million (net of $10.3 million in issuance costs) from the sale of the common stock.

Public Offering Warrants

In June 2014, as a component of our public offering, we sold 600,000 pre-funded warrants to purchase shares of our common stock. The pre-funded warrants have an exercise price of $0.01 per share and expire on June 30, 2021. During the year ended December 31, 2019, warrant holders exercised 132,130 warrants, which resulted in the issuance of 132,130 shares for net cash proceeds of $1,321. During the year ended December 31, 2020, warrant holders exercised 267,870 warrants, which resulted in the issuance of 267,870 shares for net cash proceeds of $2,679. In April 2021, warrant holders exercised 195,574 warrants using the cashless exercise provision, which resulted in the issuance of 195,461 shares and no cash proceeds. As of December 31, 2021, no warrants from the June 2014 public offering remain outstanding.

Common Stock Reserved for Future Issuance

Shares of our common stock reserved for future issuance as of December 31, 2021 were as follows:

 

 

 

Number of

 

 

 

Shares

 

Stock options outstanding

 

 

18,944

 

Restricted stock units outstanding

 

 

2,803

 

Stock options available for grant

 

 

869

 

Employee Stock Purchase Plan

 

 

201

 

Shares of common stock underlying convertible notes outstanding (see Note 8)

 

 

9,819

 

Total shares reserved for future issuance

 

 

32,636