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v3.22.2

CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Operating activities |  |
Net loss | $ (21,436) | $ (11,936)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Loss on disposal of assets | 0 | 1
Depreciation | 69 | 228
Stock-based compensation expense | 2,207 | 1,304
Amortization of premiums on short-term investments | 557 | 698
Change in fair value of derivative financial instruments—warrants | 0 | (268)
Release of clinical trial funding commitment | 139 | 926
Changes in operating assets and liabilities: |  |
Other assets | 54 | 141
Accounts receivable and unbilled receivable | (16) | 12
Prepaid expenses and other assets | 18 | 68
Operating lease right-of-use assets | 272 | 165
Accounts payable and accrued expenses | 1,367 | (1,121)
Operating lease liabilities | (143) | (461)
Other liabilities | (32) | 58
Net cash used in operating activities | (16,944) | (10,185)
Investing activities: |  |
Capital expenditures | (483) | 0
Insurance proceeds from casualty loss | 71 | 0
Maturities of short-term investments | 48,801 | 5,510
Purchases of short-term investments | (57,309) | (141,948)
Sales of short-term investments | 34,886 | 5,735
Net cash provided by (used in) investing activities | 25,966 | (130,703)
Financing activities: |  |
Proceeds from sales of common stock, net of expenses of $0 and $776, respectively | 0 | 19,225
Proceeds from exercise of warrants | 0 | 1,263
Net cash provided by financing activities | 0 | 20,488
Net change in cash and cash equivalents | 9,022 | (120,400)
Cash and cash equivalents—Beginning of period | 11,943 | 130,981
Cash and cash equivalents—End of period | 20,965 | 10,581
Supplementary disclosure of cash flow activity: |  |
Cash paid for taxes | 1 | 1
Supplemental disclosure of non-cash investing and financing activities: |  |
Acquisition of property and equipment included in accounts payable and accrued expenses | 456 | 27
Acquisition of property and equipment included in insurance proceeds receivable | 43 | 0
Preferred stock dividend payable on Series A Convertible Preferred Stock | $ 12 | $ 12

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