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v3.19.3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Operating activities |  |
Net loss | $ (19,683) | $ (19,810)
Reconciliation of net loss to net cash used in operating activities: |  |
Depreciation and amortization | 23 | 111
Stock-based compensation expense | 1,227 | 1,340
Accretion of discount/premium on investment securities | 9 | (4)
Non-cash interest expense |  | 38
Gain on disposal of property and equipment |  | (297)
Services received in non-monetary exchange | 18 | 8
Changes in assets and liabilities: |  |
Prepaid expenses and other current assets | (671) | (120)
Other assets | (25) |
Right-of-use asset-operating | (36) |
Accounts payable | 682 | 274
Accrued expenses | (287) | 267
Other liabilities | (56) | (3)
Net cash used in operating activities | (18,799) | (18,196)
Investing activities |  |
Purchases of short-term investments | (123,355) | (39,364)
Sales and maturities of short-term investments | 122,777 | 16,000
Proceeds from sale of property and equipment |  | 365
Net cash used in investing activities | (578) | (22,999)
Financing activities |  |
Proceeds from public offerings, net of issuance costs | 18,505 | 38,885
Proceeds from at-the-market offering, net of issuance costs | 3,289 | 8,313
Proceeds from exercise of common stock options and warrants | 54 | 4
Payments on borrowing |  | (2,500)
Net cash provided by financing activities | 21,848 | 44,702
Net increase in cash, cash equivalents and restricted cash | 2,471 | 3,507
Cash, cash equivalents and restricted cash, beginning of period | 15,407 | 16,482
Cash, cash equivalents and restricted cash, end of period | 17,878 | 19,989
Supplemental disclosure of cash flow information |  |
Cash paid for interest |  | $ 79
Non-cash financing activities |  |
At-the-market issuance costs included in current liabilities | $ 65 |

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