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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income (loss) $ (24,256) $ 20,753 $ (17,527)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 4,592 2,974 2,329
Stock-based compensation expense 25,650 2,929 1,998
Amortization of deferred contract acquisition costs 15,248 11,115 7,012
Provision for allowance for doubtful accounts and billing reserve 2,943 3,009 743
Other 503 0 0
Changes in operating assets and liabilities:      
Accounts receivable (443) (29,024) (5,431)
Deferred contract acquisition costs (18,775) (26,354) (8,983)
Prepaid expenses and other assets (4,617) (2,799) (418)
Accounts payable (1,247) 2,032 113
Accrued liabilities 2,311 4,986 (268)
Deferred revenue 3,985 47,799 9,392
Other long-term liabilities (705) 122 (310)
Net cash provided by (used in) operating activities 5,189 37,542 (11,350)
Cash flows from investing activities:      
Purchase of property and equipment (3,564) (1,030) (1,162)
Purchase of marketable securities (235,805) (5,000) (12,000)
Proceeds from maturities and paydowns of marketable securities 20,179 7,000 9,000
Net cash (used in) provided by investing activities (219,190) 970 (4,162)
Cash flows from financing activities:      
Proceeds from initial public offering, net of underwriting discounts 353,397 0 0
Proceeds from exercise of stock options 5,514 3,774 426
Proceeds from issuance of common stock under ESPP 1,054 0 0
Proceeds from issuance of Class B-1 preferred stock, net of issuance costs 0 0 24,953
Payment of tax withholding obligations related to net share settlements on equity awards (3,608) 0 0
Proceeds from long-term debt 0 28,381 9,508
Payment for repurchase of common stock (7,228) 0 0
Repayments of long-term debt (22,597) (28,179) (6,193)
Repayment of capital lease obligations (2,304) (1,270) (1,114)
Payments of offering costs (3,714) (1,902) 0
Net cash provided by financing activities 320,514 804 27,580
Effect of exchange rate changes on cash, cash equivalents and restricted cash 185 96 (80)
Net increase in cash, cash equivalents and restricted cash 106,698 39,412 11,988
Cash, cash equivalents and restricted cash, beginning of period 58,345 18,933 6,945
Cash, cash equivalents and restricted cash, end of period 165,043 58,345 18,933
Supplemental disclosures of cash flow information:      
Cash paid for taxes, net of refunds 337 183 238
Cash paid for interest 652 967 1,392
Supplemental disclosures of noncash investing and financing activities:      
Equipment acquired under capital leases 1,586 5,089 787
Equipment purchased funded by liabilities 391 179 74
Property and equipment purchased not yet paid 419 402 0
Conversion of convertible preferred stock and redeemable convertible preferred stock to common stock 153,857 0 0
Option exercises not yet settled 311 0 0
Deferred offering costs in accounts payable and accrued liabilities 0 1,318 0
Change in Class B-1 preferred stock redemption value 0 0 10,047
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets (in thousands):      
Cash and cash equivalents 164,948 58,243 18,844
Restricted cash included in other assets, non-current 95 102 89
Total cash, cash equivalent, and restricted cash $ 165,043 $ 58,345 $ 18,933