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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Dec. 31, 2023 USD ($) vote $ / shares shares | Dec. 04, 2023 shares | Jun. 20, 2023 shares | Mar. 21, 2023 USD ($) | Dec. 03, 2021 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) vote $ / shares shares | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares | Jan. 01, 2024 shares | Dec. 29, 2023 $ / shares | Jan. 01, 2023 shares | Oct. 16, 2018 shares | Oct. 30, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Shares issued (in shares) | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |
Shares outstanding (in shares) | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |
Options granted term |  |  |  |  |  | 10 years | 10 years |  |  |  |  |  |  |
Stock-based compensation cost not yet recognized, options | $ | $ 700 |  |  |  |  | $ 700 |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  |  |  | $ 8,200 |  |  |  |  |  |
Sale of stock, equity issuable, amount | $ |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  |  | 0 |  | 0 | $ 35,000 |  |  |  |  |
Escrowed shares (in shares) |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 12.50 |  |  |  |  |  |  |  |  |
Stock-based compensation cost | $ |  |  |  |  | $ 5,400 | $ 5,579 |  | 19,169 | 23,565 |  |  |  |  |
ATM Offering Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, equity distribution agreement, maximum offering (in shares) |  |  | 13,266,011 |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 2,069,538 |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price (in dollars per share) | $ / shares | $ 0.52 |  |  |  |  | $ 0.52 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ | $ 900 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, equity distribution agreement, remaining shares available (in shares) | 11,196,473 |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue, excluding depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  |  |  | 2,300 |  |  |  |  |  |
Stock-based compensation cost | $ |  |  |  |  |  | $ 870 |  | 3,028 | 2,788 |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Stock-based compensation cost | $ |  |  |  |  |  | 960 |  | 3,026 | 4,829 |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  |  |  | 1,900 |  |  |  |  |  |
Stock-based compensation cost | $ |  |  |  |  |  | 3,911 |  | 9,251 | 15,052 |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated cost | $ |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |
Stock-based compensation cost | $ |  |  |  |  |  | $ (162) |  | $ 3,864 | $ 896 |  |  |  |  |
2015 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio |  |  |  |  | 0.306% |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |  |
2021 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future issuance (in shares) |  |  |  |  | 31,206,550 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 1 year | 1 year |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.61 |  | $ 1.64 | $ 1.23 |  |  |  |  |
Intrinsic value of stock options exercised |  |  |  |  |  |  | $ 0 | $ 1,100 | $ 13,800 |  |  |  |  |
Stock options | 2015 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,895,765
Number of shares available for future issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 15,700,000 |
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) |  |  |  |  | 32,595,765 |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards outstanding (in shares) | 8,759,000 |  |  |  |  | 8,759,000 |  | 7,495,000 |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ | $ 5,500 |  |  |  |  | $ 5,500 |  |  |  |  |  |  |  |
Number of awards outstanding (in shares) | 2,400,000 |  |  |  |  | 2,400,000 |  |  |  |  |  |  |  |
Class A Common Stock, $0.0001 par value per share |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.25 |  |  |
Class A Common Stock, $0.0001 par value per share | 2021 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, number of additional shares authorized |  |  |  |  |  |  |  |  |  |  |  | 6,977,162 |  |
Class A Common Stock, $0.0001 par value per share | 2021 Equity Incentive Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, number of additional shares authorized |  |  |  |  |  |  |  |  |  | 7,280,589 |  |  |  |
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 |  |  |  |  |  |  |  |
Number of shares transferred (in shares) |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Class C Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 10,000,000 |  |  |  |  | 10,000,000 |  | 10,000,000 |  |  |  |  |  |
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 | 0 |  |  |  |  | 0 |  |  |  |  |  |  |  |

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