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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Stock-based compensation expense
Stock-based compensation expense included in the consolidated statements of operations was as follows:
Three Months Ended March 31,
(in thousands)
20222021
Cost of revenue
$1,513$937
Sales and marketing
10,0656,296
Research and development
6,4634,156
General and administrative
7,3575,563
Total stock-based compensation expense
$25,398$16,952
Summary of RSUs and PSUs
A summary of our RSU and PSU activity is presented below:
RSUsPSUs
(in thousands, except for per share data)
Number
of Shares		Weighted
Average
Grant Date Fair Value		Number
of Shares		Weighted
Average
Grant Date Fair Value
Unvested balance at December 31, 20215,781$37.74 —$— 
Granted
3,470 45.68 209 44.97 
Vested
(809)37.98 — — 
Forfeited
(312)37.04 — — 
Unvested balance at March 31, 20228,13041.13 20944.97 
Stock option activity
A summary of our stock option activity is presented below:
(in thousands, except for exercise prices and years)
Number
of Shares		Weighted
Average
Exercise Price		Weighted-Average Remaining Contractual Term (in years)
Aggregate Intrinsic Value
Outstanding at December 31, 20216,731$9.21 5.5$308,677
Granted
—— 
Exercised
(293)8.82 12,947
Forfeited/canceled
(57)16.13 
Outstanding at March 31, 20226,3819.17 5.1310,264
Exercisable at March 31, 20225,9648.69 5.0292,848
ESPP valuation assumptions
The fair value of the 2018 ESPP purchase rights was estimated on the offering or modification dates using a Black-Scholes option-pricing model and the following assumptions:
Three Months Ended March 31,
20222021
Expected term (in years)
0.5 — 2.0
0.5 — 2.0
Expected volatility
42.8% — 51.7%
52.0% — 59.4%
Risk-free interest rate
0.1%
0.1%
Expected dividend yield——