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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Significant Accounting Policies |
Schedule of cash and cash equivalents | Cash and cash equivalents consist of the following (in thousands):
|  | December 31, |
|  | 2017 |  | 2016 |
Cash |  | $ | 2,781 |  | $ | 1,173 |
Money market fund |  |  | 13,588 |  |  | 22,423 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 16,369 |  | $ | 23,596 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of stock-based compensation expense | During the years ended December 31, 2017, 2016 and 2015, the Company recorded stock-based compensation expense for employee and non-employee stock options and restricted stock, which was allocated as follows in the statements of operations (in thousands):
|  | Year Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Research and development |  | $ | 784 |  | $ | 723 |  | $ | 681 |
General and administrative |  |  | 1,223 |  |  | 1,437 |  |  | 977 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  | $ | 2,007 |  | $ | 2,160 |  | $ | 1,658 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Schedule of anti-dilutive common stock equivalents excluded from calculation of diluted net loss per share |
|  | Year Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Stock options |  |  | 2,845,626 |  |  | 2,270,169 |  |  | 1,723,554 |
Common stock warrants |  |  | 24,566 |  |  | 24,566 |  |  | 59,405 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 2,870,192 |  |  | 2,294,735 |  |  | 1,782,959 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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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://www.xbrl.org/2003/role/presentationRef -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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