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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net loss | $ (5,509) | $ (2,652)
Adjustments to reconcile net loss to cash used in operating activities: |  |
Depreciation and amortization | 86 | 38
Equity-based compensation | 365 | 380
Amortization of long-term debt issuance costs and fees | 24 | 50
Other | 73 | 0
Change in fair value of warrant liabilities | 128 | (38)
Changes in operating assets and liabilities: |  |
Unbilled revenue receivable and accounts receivable | 8 | (449)
Receivable from related party | (4) | (5)
Prepaid expenses and other current assets | 311 | (556)
Deferred offering costs | 0 | (241)
Other noncurrent assets | 0 | (19)
Accounts payable | (120) | 58
Accrued expenses and other current liabilities | (8) | (1,581)
Deferred revenue | 0 | (1,982)
Other noncurrent liabilities | (1) | 0
Net cash used in operating activities | (4,647) | (6,997)
Cash flows from investing activities: |  |
Capital expenditures | 0 | (245)
Net cash used in investing activities | 0 | (245)
Cash flows from financing activities: |  |
Proceeds from exercise of common stock options | 7 | 43
Net cash provided by financing activities | 7 | 43
Net increase decrease in cash and cash equivalents | (4,640) | (7,199)
Cash and cash equivalents - beginning of period | 25,764 | 19,623
Cash and cash equivalents - end of period | 21,124 | 12,424
Non-cash financing activities: |  |
Issuance of common stock for professional services | 436 | 0
Deferred offering costs (accounts payable and accrued expenses) | 0 | 733
Capital expenditures (accounts payable and accrued expenses) | $ 45 | $ 268

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