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v3.20.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |
Net loss | $ (26,293) | $ (25,870)
Reconciliation of net loss to net cash used in operating activities: |  |
Depreciation and amortization | 26 | 119
Stock-based compensation expense | 1,512 | 1,771
Accretion of discount/premium on investment securities | 5 | (6)
Non-cash interest expense |  | 37
Gain on disposal of property and equipment | 18 | (297)
Services received in non-monetary exchange | 33 | 19
Changes in assets and liabilities: |  |
Prepaid expenses and other current assets | (1,289) | (177)
Other assets |  | (85)
Right-of-use asset-operating | (96) |
Accounts payable | (211) | 662
Accrued expenses | (205) | 396
Other liabilities | (69) | (34)
Net cash used in operating activities | (26,569) | (23,465)
Investing activities |  |
Purchases of short-term investments | (155,197) | (70,364)
Sales and maturities of short-term investments | 151,127 | 48,090
Purchases of property and equipment | (12) |
Proceeds from sale of property and equipment |  | 369
Net cash used in investing activities | (4,082) | (21,905)
Financing activities |  |
Proceeds from public offerings, net of issuance costs | 18,505 | 38,886
Proceeds from at-the-market offering, net of issuance costs | 7,061 | 8,253
Proceeds from exercise of common stock options and warrants | 54 | 4
Payments on borrowing |  | (2,848)
Net cash provided by financing activities | 25,620 | 44,295
Net increase in cash, cash equivalents and restricted cash | (5,031) | (1,075)
Cash, cash equivalents and restricted cash, beginning of period | 15,407 | 16,482
Cash, cash equivalents and restricted cash, end of period | 10,376 | 15,407
Supplemental disclosure of cash flow information |  |
Cash paid for interest |  | 79
Non-cash investing activities: |  |
Fixed asset purchases included in accounts payable |  | 18
Non-cash financing activities |  |
At-the-market issuance costs included in current liabilities | $ 65 | $ 110

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