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v3.22.4

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities |  |  |
Net loss | $ (116,155) | $ (101,361) | $ (43,830)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 13,405 | 9,842 | 6,900
Stock-based compensation | 57,740 | 54,527 | 41,515
Amortization of premium and accretion of discounts on investments, net | (474) | 1,641 | 430
Provision for doubtful accounts and contractual allowances | 58,349 | 37,074 | 31,431
Amortization of operating lease right-of-use assets | 6,204 | 6,752 | 6,030
Impairment charges | 23,164 | 0 | 0
Other | 264 | 0 | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (61,837) | (53,572) | (37,957)
Inventory | (5,108) | (4,960) | (1,389)
Prepaid expenses and other current assets | (862) | (2,329) | (3,027)
Other assets | (6,200) | (1,831) | (6,149)
Accounts payable | (2,993) | 6,135 | (3,881)
Accrued liabilities | 14,473 | 7,946 | 1,308
Deferred revenue | 2 | 2,119 | (321)
Operating lease liabilities | (6,263) | (2,087) | (4,819)
Reimbursement of tenant improvement allowance | 3,279 | 2,351 | 0
Net cash used in operating activities | (23,012) | (37,753) | (13,759)
Cash flows from investing activities |  |  |
Purchases of property and equipment | (29,830) | (28,067) | (13,551)
Purchases of short-term investments | (188,569) | (122,184) | (277,510)
Sales of short-term investments | 34,965 | 0 | 14,525
Maturities of short-term investments | 131,000 | 255,515 | 144,145
Net cash (used in) provided by investing activities | (52,434) | 105,264 | (132,391)
Cash flows from financing activities |  |  |
Payment of loans | (21,389) | (11,667) | (1,944)
Proceeds from term loans | 35,000 | 0 | 0
Issuance of common stock in connection with follow-on public offering, net | 0 | 0 | 206,025
Proceeds from issuance of common stock in connection with employee equity incentive plans | 13,182 | 8,943 | 20,244
Tax withholding upon vesting of restricted stock awards | 0 | (25,853) | (10,009)
Payment of issuance costs for long-term debt | (77) | 0 | 0
Net cash provided by (used in) financing activities | 26,716 | (28,577) | 214,316
Net (decrease) increase in cash and cash equivalents | (48,730) | 38,934 | 68,166
Cash and cash equivalents, beginning of year | 127,562 | 88,628 | 20,462
Cash and cash equivalents, end of year | 78,832 | 127,562 | 88,628
Supplemental disclosures of cash flow information: |  |  |
Interest paid | 3,317 | 1,194 | 1,502
Cash taxes paid | 287 | 0 | 0
Non-cash investing and financing activities: |  |  |
Property and equipment costs included in accounts payable and accrued liabilities | 160 | 9 | 3
Right-of-use assets obtained in exchange for operating lease liabilities | 7,686 | 6,625 | 621
Capitalized stock-based compensation | $ 5,863 | $ 3,593 | $ 1,129

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