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Stockholders' Equity
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Stockholders' Equity Stockholders' Equity
Securities Repurchase Program

In June 2022, our board of directors approved a $1.0 billion increase to our existing securities repurchase program authorizing the repurchase of up to $2.0 billion of our common stock and/or convertible notes, through open market purchases, block trades, and/or privately negotiated transactions or pursuant to Rule 10b5-1 plans, in compliance with applicable securities laws and other legal requirements. The timing, volume, and nature of the repurchases will be determined by management based on the capital needs of the business, market conditions, applicable legal requirements, and other factors. $1.1 billion remains under the repurchase program, which has no expiration date and will continue until otherwise suspended, terminated or modified at any time for any reason by our board of directors.

Accelerated Share Repurchases

On February 22, 2022, we entered into an accelerated share repurchase (ASR) agreement with a financial institution (2022 ASR). We accounted for the 2022 ASR as two separate transactions, a repurchase of our common stock and an equity-linked contract indexed to our common stock that met certain accounting criteria for classification in stockholders' equity. Upon execution, we paid a fixed amount of $300.0 million and received an initial delivery of 8,562,255 shares of our common stock over the following three business days, which were retired immediately. The initial delivery of shares of our common stock represented approximately 80 percent of the fixed amount paid of $300.0 million, which was based on the share price of our common stock on the date of execution. The 2022 ASR was recorded as a reduction to additional paid in capital on our condensed consolidated statements of stockholders’ equity. The 2022 ASR settled during the three months ended June 30, 2022 and we received an additional delivery of 837,001 shares of our common stock, which were retired immediately. The 2022 ASR resulted in a total repurchase of 9,399,256 shares of our common stock at a volume-weighted-average price, less an agreed upon discount, $31.9174 per share. We were not required to make any additional cash payments or delivery of common stock to the financial institutions upon settlement.

On December 3, 2021, we entered into an ASR agreement with a financial institution (2021 ASR) to repurchase $300.0 million of our outstanding common stock. The 2021 ASR settled during the three months ended March 31, 2022 and we received an additional delivery of 2,163,219 shares of our common stock.

Share-based Compensation Expense

Total share-based compensation expense recorded for employees and non-employees is as follows (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2022202120222021
Cost of revenues$669 $419 $1,292 $781 
Research and development10,006 9,100 21,782 17,059 
Sales and marketing4,019 3,655 8,405 6,574 
General and administrative16,393 15,371 32,692 27,231 
Total share-based compensation expense$31,087 $28,545 $64,171 $51,645 

During the three and six months ended June 30, 2022, we capitalized share-based compensation expense of $2.3 million and $4.1 million, respectively. During the three and six months ended June 30, 2021, we capitalized share-based compensation expense of $0.7 million and $1.2 million, respectively.
RSU and PSU Activity

Activity for RSUs and PSUs is as follows:
 RSUs and PSUs Outstanding
 Shares OutstandingWeighted Average Grant Date Fair Value
Balance at December 31, 20218,171,462 $46.36 
Granted3,905,418 29.71 
Released(1,003,448)65.24 
Forfeited(1,226,520)41.29 
Balance at June 30, 20229,846,912 $38.49 

As of June 30, 2022, our total unrecognized share-based compensation expense related to RSUs and PSUs was approximately $265.3 million, which will be recognized over the remaining weighted-average vesting period of approximately 2.5 years.