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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net loss | $ (25,406) | $ (17,278) | $ (28,569)
Adjustments to reconcile net loss to net cash from operating activities: |  |  |
Depreciation | 18 | 26 | 28
Amortization of warrant issuance costs | 0 | 0 | 30
Stock-based compensation | 4,055 | 3,986 | 5,398
Changes in assets and liabilities: |  |  |
Prepaid expenses and other assets | 258 | 382 | 451
Accounts payable | 636 | (1,392) | (477)
Other liabilities | 0 | 140 | 0
Accrued payroll and related expenses | (1,856) | 695 | 232
Accounts receivable | (6) | 0 | 0
Related-party payable | 0 | 0 | (11)
Income tax liability | 3 | (3) | (4)
Deferred revenue | 0 | (1,500) | 1,000
Net cash used in operating activities | (22,298) | (14,944) | (21,922)
Cash flows from investing activities: |  |  |
Purchase of property and equipment | 0 | 0 | (13)
Purchase of investments | (3,090) | (946) | (10,527)
Proceeds from sale or maturity of investments | 2,720 | 8,741 | 11,240
Net cash (used in) provided by investing activities | (370) | 7,795 | 700
Cash flows from financing activities: |  |  |
Proceeds from exercise of options | 135 | 22 | 20
Proceeds from sale of common stock | 27,051 | 3,677 | 19,196
Payments of taxes on cashless exercise of restricted stock units | (42) | (42) | (93)
Net cash provided by financing activities | 27,144 | 3,657 | 19,123
Net increase (decrease) in cash and cash equivalents | 4,476 | (3,492) | (2,099)
Cash and cash equivalents, beginning of period | 3,135 | 6,627 | 8,726
Cash and cash equivalents, end of period | 7,611 | 3,135 | 6,627
Cash paid for income taxes | 3 | 5 | 126
ASU Topic 606 [Member] |  |  |
Cash flows from financing activities: |  |  |
Deferred revenue reclassified to retained earnings - ASC 606 adoption | $ 2,500 | $ 0 | $ 0

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