v3.24.1.u1
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities    
Net loss $ (31,752) $ (74,771)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 8,397 11,764
Depreciation and amortization expense 1,391 1,214
Accretion of liability related to sale of future revenues 1,046 1,204
Amortization (accretion) of investment premiums (discounts) 37 (351)
Non-cash operating lease expense 2,954 2,879
Other non-cash items, net 48 80
Changes in operating assets and liabilities:    
Accounts receivable (1,726) 39,824
Inventories (6,378) (3,754)
Other current assets (2,061) (2,584)
Other assets 443 (156)
Accounts payable (826) (1,886)
Accrued compensation (5,812) (8,746)
Accrued research and development expenses (1,436) (1,226)
Other current liabilities (742) (609)
Deferred revenue 8,478 2,965
Operating lease liabilities (1,673) (4,174)
Other long-term liabilities 0 (102)
Net cash used in operating activities (29,612) (38,429)
Investing activities    
Purchases of short-term investments 0 (67,903)
Proceeds from maturities and sales of short-term investments 14,844 62,295
Purchases of property and equipment (127) (399)
Net cash provided by investing activities 14,717 (6,007)
Financing activities    
Proceeds from sale of pre-funded warrants to purchase common stock in a registered direct offering, net 15,000 0
Proceeds from issuance of common stock through ATM facilities, net 9,374 640
Proceeds from employee stock awards 0 0
Taxes paid related to net share settlement of restricted stock units (6) (93)
Principal payments on finance lease obligations (227) (312)
Net cash provided by financing activities 24,141 235
Decrease in cash, cash equivalents and restricted cash 9,246 (44,201)
Cash, cash equivalents and restricted cash at beginning of period 25,987 93,088
Cash, cash equivalents and restricted cash at end of period 35,233 48,887
Non-cash investing and financing activities    
Property and equipment purchases included in accounts payable and other accrued liabilities 0 194
Accrued costs related to direct registered offering 177 0
Accrued costs related to ATM facility 26 73
Supplemental cash flow disclosure    
Cash paid for interest 114 112
Cash paid for income taxes $ 24 $ 1

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