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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Summary of Significant Accounting Policies |
Schedule of stock-based compensation expense | During the three and nine months ended September 30, 2019 and 2018, the Company recorded stock-based compensation expense, which was allocated as follows in the condensed consolidated statements of operations (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Research and development |  | $ | 162 |  | $ | 168 |  | $ | 462 |  | $ | 505
General and administrative |  |  | 216 |  |  | 248 |  |  | 765 |  |  | 835
Total |  | $ | 378 |  | $ | 416 |  | $ | 1,227 |  | $ | 1,340
Schedule of anti-dilutive common stock equivalents excluded from calculation of diluted net loss per share |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Stock options |  | 843,183 |  | 448,946 |  | 843,183 |  | 448,946
Common stock warrants |  | 6,193,749 |  | 4,202,457 |  | 6,193,749 |  | 4,202,457
|  | 7,036,932 |  | 4,651,403 |  | 7,036,932 |  | 4,651,403
Schedule of reconciliation of cash, cash equivalents and restricted cash |
|  | September 30,
|  | 2019 |  | 2018
Cash and cash equivalents |  | $ | 17,765 |  | $ | 19,876
Restricted cash (1) |  |  | 113 |  |  | 113
Total |  | $ | 17,878 |  | $ | 19,989
| (1) |  | Included in prepaid expenses and other current assets as of September 30, 2019 and other assets as of September 30, 2018 in the condensed consolidated balance sheets

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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