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Equity Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Weighted-Average Fair Value Per Share for Stock Purchased Under ESPP Based on Assumptions
The assumptions used and the resulting weighted-average fair value per share for stock purchased under the ESPP during the three months ended June 30, 2020 were as follows:
Risk-free interest rate1.85 %
Expected volatility52.18 %
Expected term (years)0.67
Expected dividends%
Weighted average grant-date fair value per share$12.60
Recorded Stock-based Compensation Expense in the Condensed Consolidated Statement of Operations
The Company recorded stock-based compensation expense in the condensed consolidated statement of operations for the periods presented as follows (in thousands):
Three Months Ended
June 30,
Six Months Ended
June 30,
2020201920202019
Cost of revenue$463  $58  $710  $90  
Research and development6,044  1,291  8,931  1,798  
Selling, general and administrative7,348  1,676  10,932  2,496  
Total stock-based compensation expense$13,855  $3,025  $20,573  $4,384  
Summary of RSU activity
The Company began granting restricted stock unit awards (“RSUs”) to employees and other service providers during the first quarter of 2020. RSU activity for the six months ended June 30, 2020 is as follows:
Restricted Stock
Units
Weighted-Average
Grant Date Fair Value
(per share)
Outstanding as of December 31, 2019—  $—  
Granted745,587  66.42  
Vested(40,999) 65.91  
Cancelled(1,978) 64.32  
Outstanding as of June 30, 2020702,610  $66.46  
Summary of the Company's Stock Option Activity
Stock options activity for the six months ended June 30, 2020 is as follows:
Stock OptionsWeighted-Average
Exercise Price
Outstanding as of December 31, 201915,918,243  $6.82  
Granted1,646,898  76.98  
Exercised(3,858,369) 1.91  
Cancelled(199,542) 10.32  
Outstanding as of June 30, 202013,507,230  $16.72