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Stockholders’ Deficit (Tables)
3 Months Ended
Mar. 31, 2022
Stockholders' Equity Note [Abstract]  
Schedule of Stock Option and Restricted Stock Activity
Stock option and restricted stock activity for the Plans was as follows for the three months ended March 31, 2022:

Options outstandingRestricted stock
outstanding
Number of
shares
available for
issuance
under the
Plans
Number of
shares
outstanding
under the
Plans
Weighted-
average
exercise
price
per share
Weighted-
average
remaining
contractual
term
(In years)
Aggregate intrinsic valueNumber of Plan shares outstandingWeighted-
average
grant date
fair value
per share
Balance at December 31, 202195.2 0.9 $12.09 5.4$10.0 27.8 $24.17 
Additional shares authorized18.8 — — — — — — 
Options exercised and restricted stock units and awards released— (0.1)2.05 — — (3.9)24.65 
Options and restricted stock units and awards canceled2.0 — 4.86 — — (1.9)22.29 
Shares withheld related to net share settlement of restricted stock units and awards1.5 — — — — — 24.85 
Options and restricted stock units and awards granted(4.7)— — — — 4.7 24.04 
Balance as of March 31, 2022
112.8 0.8 $13.38 5.0$7.1 26.7 $24.22 
Vested at March 31, 2022
0.5 $17.53 4.0$3.2 — $— 
Unvested at March 31, 2022
0.3 $3.20 $3.9 26.7 $24.22 
Schedule of Pre-Tax Intrinsic Value of Options Exercised
The following table summarizes information about the pre-tax intrinsic value of options exercised during the three months ended March 31, 2022 and 2021:

Three Months Ended
March 31,
20222021
Intrinsic value of options exercised$1.4 $4.7 
Fair Value of Stock Options Assumptions Used The fair value of stock options assumed were estimated using the following assumptions:
Expected volatility47 %
Expected term (in years)
2.0 - 6.8
Risk-free interest rate
0.15% - 1.29%
Dividend yield— %