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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities: |  |
Net loss | $ (20,804) | $ (24,904)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation expense | 26 | 37
Amortization of contract asset | 101 |
Amortization on right-of-use asset | 406 | 541
Stock-based compensation expense | 1,857 | 2,796
Foreign currency (gain) loss | (189) | 114
Change in fair value of restricted stock liability | (94) | 159
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | 727 | 280
Research and development incentive receivable | (20) | (128)
Contract acquisition costs | (270) |
Accounts payable and accrued expenses | (3,206) | 717
Deferred revenue | 1,875 |
Lease liability | (378) | (506)
Net cash used in operating activities | (19,969) | (21,008)
Cash flows from investing activities: |  |
Proceeds from the sale of property and equipment | 25 |
Purchases of property and equipment |  | (100)
Net cash provided by (used) in investing activities | 25 | (100)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock - June 2020 Public Offering | 48,518 |
Proceeds from issuance of common stock |  | 12,331
Proceeds from issuance of common stock from ATM sales |  | 1,923
Proceeds from issuance of common stock in connection with July 2019 Lincoln Park Capital Registered Offering Purchase Agreement, net of issuance costs |  | 999
Proceeds from the exercise of common stock warrants | 348 |
Proceeds from the exercise of stock options | 51 |
Payment of deferred offering costs | (1,906) | (417)
Net cash provided by financing activities | 73,997 | 14,836
Effect of exchange rate changes on cash and cash equivalents | 31 | 46
Net increase (decrease) in cash and cash equivalents | 54,084 | (6,226)
Cash and cash equivalents at beginning of period | 3,891 | 16,284
Cash and cash equivalents at end of period | 57,975 | 10,058
Supplemental disclosure of non-cash financing activities: |  |
Reclassification of 2017 Warrants from liability to equity |  | 3,448
Dividend attributable to down round feature of warrants | 303 | 359
Offering costs included in accounts payable and accrued expenses - February 2019 Public Offering |  | 20
Right-of-use asset recorded upon adoption of ASU 2016-02 |  | 1,720
Lease liability recorded upon adoption of ASU 2016-02 |  | 1,720
Prepaid rent reclassified upon adoption of ASU 2016-02 |  | $ 35
Conversion of Series A convertible preferred stock to prefunded warrants | (8,836) |
Conversion of Series B convertible preferred stock to common stock | (7,087) |
Series A & B Convertible Preferred Stock discount - beneficial conversion feature | (9,399) |
Series A Convertible Preferred Stock |  |
Cash flows from financing activities: |  |
Proceeds from the issuance of Series convertible preferred stock | 14,986 |
Supplemental disclosure of non-cash financing activities: |  |
Conversion of Series A convertible preferred stock to prefunded warrants | 8,836 |
Series A & B Convertible Preferred Stock discount - beneficial conversion feature | 5,226 |
Series B Convertible Preferred Stock |  |
Cash flows from financing activities: |  |
Proceeds from the issuance of Series convertible preferred stock | 12,000 |
Supplemental disclosure of non-cash financing activities: |  |
Conversion of Series B convertible preferred stock to common stock | 7,087 |
Series A & B Convertible Preferred Stock discount - beneficial conversion feature | $ 4,173 |

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