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v3.22.1

CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Operating activities |  |
Net loss | $ (10,993) | $ (5,179)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Loss on disposal of assets | 0 | 1
Depreciation | 31 | 119
Stock-based compensation expense | 1,152 | 268
Amortization of premiums on short-term investments | 346 | 204
Change in fair value of derivative financial instruments—warrants | 0 | (207)
Release of clinical trial funding commitment | 139 | 380
Changes in operating assets and liabilities: |  |
Other assets | 51 | 166
Accounts receivable and unbilled receivable | 88 | 79
Prepaid expenses and other assets | (1,141) | (183)
Operating lease right-of-use assets | 136 | 82
Accounts payable and accrued expenses | 0 | (1,421)
Operating lease liabilities | (16) | (227)
Other liabilities | (42) | 34
Net cash used in operating activities | (10,249) | (5,884)
Investing activities: |  |
Capital expenditures | (171) | 0
Maturities of short-term investments | 38,217 | 0
Purchases of short-term investments | (36,773) | (114,195)
Sales of short-term investments | 17,085 | 2,497
Net cash provided by (used in) investing activities | 18,358 | (111,698)
Financing activities: |  |
Proceeds from exercise of warrants | 0 | 1,263
Net cash provided by financing activities | 0 | 1,263
Net change in cash and cash equivalents | 8,109 | (116,319)
Cash and cash equivalents—Beginning of period | 11,943 | 130,981
Cash and cash equivalents—End of period | 20,052 | 14,662
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 | 27 | 0
Preferred stock dividend payable on Series A Convertible Preferred Stock | $ 6 | $ 6

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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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