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Schedule I - Condensed Financial Information of Registrant - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Cash Flow Statements |  |  |
Operating activities: | $ 82,749 | $ 21,216 | $ 29,433
Investing activities: |  |  |
Net cash used in investing activities | (158,614) | (9,751) | (63,195)
Financing activities |  |  |
Repurchase of vested options |  | (15,506) |
Proceeds from Series A preferred stock issuance, net of issuance costs |  | 346,150 |
Payments to shareholders for preferred stock Series A |  | (260,686) |
Proceeds from common stock issued upon exercise of stock options | 12,440 | 780 | 177
Proceeds from common stock issued under employee purchase plan | 404 | 424 |
Proceeds from issuance of common stock upon initial public offering | 269,390 |  |
Proceeds from issuance of common stock in connection to concurrent private placement | 30,000 |  |
Payments for offering costs | (22,069) | (3,610) |
Shares repurchased for settlement of employee tax withholdings | 1,802 |  |
Net cash provided by financing activities | 264,395 | 10,385 | 15,045
Effect of exchange rate changes on cash and cash equivalents | (200) | 203 | 23
Net increase (decrease) in cash, cash equivalents, and restricted cash | 188,330 | 22,053 | (18,694)
Cash, cash equivalents, and restricted cash-Beginning of period | 33,395 | 11,342 | 30,036
Cash, cash equivalents, and restricted cash-End of period | 221,725 | 33,395 | 11,342
Noncash investing and financing transactions: |  |  |
Common stock issued in connection with acquisition | 22,526 |  |
Exchange of common stock for preferred stock |  | 260,686 |
Treasury stock reissued upon the conversion of Series A preferred stock for common stock | 260,686 |  |
Parent Company | Reportable Legal Entities |  |  |
Condensed Cash Flow Statements |  |  |
Operating activities: | 67,294 | 18,214 | (94)
Investing activities: |  |  |
Transfer of funds to subsidiary | (179,825) | (83,000) | (1,787)
Net cash used in investing activities | (179,825) | (83,000) | (1,787)
Financing activities |  |  |
Repurchase of vested options |  | (15,506) |
Proceeds from Series A preferred stock issuance, net of issuance costs |  | 346,150 |
Payments to shareholders for preferred stock Series A |  | (260,686) |
Proceeds from common stock issued upon exercise of stock options | 12,440 | 780 | 177
Proceeds from common stock issued under employee purchase plan | 404 | 424 |
Proceeds from issuance of common stock upon initial public offering | 269,390 |  |
Proceeds from issuance of common stock in connection to concurrent private placement | 30,000 |  |
Payments for offering costs | (17,214) |  |
Shares repurchased for settlement of employee tax withholdings | (1,802) |  |
Net cash provided by financing activities | 293,218 | 71,162 | 177
Effect of exchange rate changes on cash and cash equivalents |  |  | (67)
Net increase (decrease) in cash, cash equivalents, and restricted cash | 180,687 | 6,376 | (1,771)
Cash, cash equivalents, and restricted cash-Beginning of period | 6,418 | 42 | 1,813
Cash, cash equivalents, and restricted cash-End of period | 187,105 | 6,418 | $ 42
Noncash investing and financing transactions: |  |  |
Common stock issued in connection with acquisition | 22,526 |  |
Exchange of common stock for preferred stock |  | $ 260,686 |
Treasury stock reissued upon the conversion of Series A preferred stock for common stock | 260,686 |  |
Due to consolidated subsidiaries | $ 68,940 |  |

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