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Stockholders' Equity - Narrative (Details) |  |  |  | 12 Months Ended | 18 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 20, 2023 shares | Mar. 21, 2023 USD ($) | Dec. 03, 2021 shares | Dec. 31, 2024 USD ($) vote $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2024 USD ($) vote $ / shares shares | Jan. 01, 2025 shares | Jul. 31, 2024 USD ($) | Jan. 01, 2024 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 50,000,000 |  |  | 50,000,000 |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 0 | 0 |  | 0 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  | 0 | 0 |  | 0 |  |  |
Options granted term (in years) |  |  |  | 10 years |  |  |  |  |  |
Stock-based compensation cost not yet recognized, options | $ |  |  |  | $ 7,800,000 |  |  | $ 7,800,000 |  |  |
Accelerated cost | $ |  |  |  |  |  | $ 8,200,000 |  |  |  |
Sale of stock, equity issuable, amount | $ |  | $ 150,000,000 |  |  |  |  |  |  |  |
ATM Offering Agreement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, equity distribution agreement, maximum offering (in shares) | 3,316,503 |  |  |  |  |  |  |  |  |
Sale of stock, increase in aggregate offering price | $ |  |  |  |  |  |  |  |  | $ 150,000,000 |
Number of shares issued (in shares) |  |  |  |  |  |  | 1,149,013 |  |  |
Issue price (in dollars per share) | $ / shares |  |  |  | $ 2.46 |  |  | $ 2.46 |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  |  |  | $ 2,800,000 |  |  |
Cost of revenue, excluding depreciation and amortization |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  | 2,300,000 |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  | 1,000,000 |  |  |  |
General and administrative |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  | 1,900,000 |  |  |  |
Research and development |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  | $ 3,000,000 |  |  |  |
2015 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 4 years |  |  |  |  |  |
2021 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for future issuance (in shares) |  |  | 7,801,638 |  |  |  |  |  |  |
Increase in number of shares reserved for issuance as percentage of total number of outstanding shares |  |  | 5.00% |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted-average remaining requisite service period (in years) |  |  |  | 1 year 1 month 6 days |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 2.19 | $ 2.44 | $ 6.56 |  |  |  |
Intrinsic value of stock options exercised | $ |  |  |  | $ 0 | $ 0 | $ 1,100,000 |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of awards outstanding (in shares) |  |  |  | 1,103,000 | 2,190,000 |  | 1,103,000 |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  | $ 1,400,000 |  |  | $ 1,400,000 |  |  |
Number of awards outstanding (in shares) |  |  |  | 600,000 |  |  | 600,000 |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 700,000,000 | 700,000,000 |  | 700,000,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |  |  |
Common shares, votes per share (in vote per share) | vote |  |  |  | 1 |  |  | 1 |  |  |
Class A Common Stock | 2021 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, number of additional shares authorized |  |  |  |  |  |  |  |  |  | 1,820,147
Class A Common Stock | 2021 Equity Incentive Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, number of additional shares authorized |  |  |  |  |  |  |  | 1,918,422 |  |
Class B Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 20,000,000 | 20,000,000 |  | 20,000,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |  |  |
Common shares, votes per share (in vote per share) | vote |  |  |  | 50 |  |  | 50 |  |  |
Class C Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 10,000,000 |  |  | 10,000,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |  |
Common shares, votes per share (in vote per share) | vote |  |  |  | 0 |  |  | 0 |  |  |

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