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

We are authorized to issue a total of 600.0 million shares of common stock as of December 31, 2021. Holders of our common stock are not entitled to receive dividends unless declared by our board of directors. As of December 31, 2021, we had 199.6 million shares of common stock outstanding and had reserved shares of common stock for future issuance as follows (in thousands): 
 December 31, 2021
Stock plans:
Options outstanding1,305 
RSUs (1)
5,808 
Shares of common stock available for future grants:
2021 Equity Incentive Plan (2)
8,501 
Amended and Restated 2012 Employee Stock Purchase Plan (2)
9,389 
Total shares of common stock reserved for future issuance25,003 
 
(1)Represents the number of shares issuable upon settlement of outstanding RSUs and PRSUs, as discussed under in Note 14.
(2)Refer to Note 14 for a description of these plans.

During the years ended December 31, 2021 and 2020, we issued a total of 3.2 million shares and 4.1 million shares, respectively, from stock option exercises, vesting of RSUs, net of employee payroll taxes and purchases from ESPP. In addition, as described in Note 11, we issued 0.5 million and 2.3 million shares of our common stock upon partial unwind of the 2022 Warrants during the year ended December 31, 2021 and 2020, respectively.
Preferred Stock

Our board of directors has the authority, without further action by stockholders, to issue up to 10 million shares of preferred stock in one or more series. Our board of directors may designate the rights, preferences, privileges and restrictions of the preferred stock, including dividend rights, conversion rights, voting rights, terms of redemption, liquidation preference and number of shares constituting any series or the designation of any series. The issuance of preferred stock could have the effect of restricting dividends on our common stock, diluting the voting power of our common stock, impairing the liquidation rights of our common stock, or delaying or preventing a change in control. At December 31, 2021 and 2020, no shares of preferred stock were outstanding.