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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |
Net loss | $ (2,574,000) | $ (2,044,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 36,000 | 82,000
Stock-based compensation | 165,000 | 134,000
Accrued interest | 30,000 | 112,000
Amortization of lease right-of-use asset | 98,000 | 43,000
Change in operating lease liability | (93,000) | (50,000)
Gain on settlement of convertible notes payable and accrued interest, net | (48,000) |
Changes in assets and liabilities: |  |
Accounts receivable | 69,000 | 574,000
Inventories | (427,000) | (48,000)
Prepaid expenses and other assets | 280,000 | 221,000
Accounts payable | 13,000 | (170,000)
Deferred revenue and other liabilities | 276,000 | (19,000)
Net cash used in operating activities | (2,754,000) | (1,165,000)
Cash flows from investing activities: |  |
Purchases of property and equipment | (11,000) | (12,000)
Proceeds from maturities of short-term investments |  | 300,000
Purchases of investments | (9,579,000) |
Net cash provided by (used in) investing activities | (9,590,000) | 288,000
Cash flows from financing activities: |  |
Proceeds from sale of common stock, net | 18,785,000 | 1,619,000
Proceeds from exercise of common stock warrants | 4,174,018 | 2,000
Repayment of convertible notes payable | (3,027,000) |
Taxes paid to net share settle equity awards | (2,000) | (1,000)
Net cash provided by financing activities | 19,930,000 | 2,199,000
Net increase in cash and cash equivalents | 7,586,000 | 1,322,000
Cash and cash equivalents at beginning of period | 5,889,000 | 6,053,000
Cash and cash equivalents at end of period | 13,475,000 | 7,375,000
Supplemental disclosure: |  |
Issuance of convertible notes in settlement of accrued interest |  | 112,000
Settlement of accrued interest through issuance of common shares | 123,000 |
Fair value of warrant exercise price adjustment considered as deemed dividend |  | 392,000
PPP Note |  |
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Gain on extinguishment of PPP Note | $ (579,000) |
Cash flows from financing activities: |  |
Proceeds from PPP note |  | $ 579,000

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