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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Equity Awards Available for Grant
A summary of equity awards available for grant is as follows (in thousands):
Equity Available
for Grant
Balances as of December 31, 2019
3,410 
Retroactive application of reverse recapitalization684 
Balance as of December 31, 2019, as converted4,094 
Options authorized1,801 
Options granted(1)(11,258)
Options canceled and forfeited(1)10,562 
Balances as of December 31, 2020
5,199 
Equity awards authorized17,200 
Equity awards granted(3,348)
Equity awards canceled in connection with termination of 2011 Plan(7,005)
Equity awards canceled and forfeited2,037 
Balances as of December 31, 2021
14,083 
________________
(1)Includes options that were canceled and re-granted as part of the option repricing modification, as further discussed below.
Schedule of stock option activity
A summary of stock option activity is as follows (in thousands, except per share amounts and years):
Number of
Options
Outstanding		Weighted-
Average
Exercise Price
Per Share		Weighted-
Average
Remaining
Contractual
Term (Years)		Aggregate
Intrinsic
Value
Balances as of December 31, 2019
20,749 $1.98 7.1$34,776 
Retroactive application of reverse recapitalization4,162 
Balance as of December 31, 2019, as converted24,911 1.65 7.1$34,776 
Options granted(1)
11,258 2.08 
Options exercised(907)0.85 
Options canceled and forfeited(1)
(10,562)2.67 
Balances as of December 31, 2020
24,700 $1.45 6.4$83,570 
Options exercised(4,634)0.93 
Options canceled and forfeited(2,008)1.17 
Balances as of December 31, 2021
18,058 $1.60 6.1$147,219 
Options vested and exercisable – December 31, 2021
14,342 $1.48 5.6$118,563 
________________
(1)Includes options that were canceled and re-granted as part of the option repricing modification, as further discussed below.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table presents the range of assumptions used to estimate the fair value of options granted during the periods presented:
Year Ended December 31,
20202019
Risk-free interest rate
0.24% - 1.43%
1.38% - 2.60%
Expected term (years)
3.99 - 6.80
4.51 - 6.75
Volatility
49.0% - 54.8%
44.5% - 46.3%
Dividend yield— %— %
Share-based Payment Arrangement, Restricted Stock Unit, Activity A summary of restricted stock unit activity is as follows (in thousands, except per share amounts):
Number of
Shares		Weighted-
Average
Grant Date
Fair Value		Aggregate
Intrinsic
Value
Unvested January 1, 2021— $— 
Granted3,348 12.05 
Vested(456)12.25 
Forfeited(29)12.15 
Unvested December 31, 20212,863 12.02 $27,919 
Schedule of stock-based compensation expense The following table summarizes stock-based compensation expense recorded in each component of costs and expenses in the Company’s consolidated statements of operations for the presented periods (in thousands):
Year Ended December 31,
202120202019
Operations and support$545 $299 $277 
Marketing725 397 301 
Product development3,821 1,873 1,486 
General and administrative5,970 2,972 2,003 
Total stock-based compensation expense$11,061 $5,541 $4,067