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Summary of Significant Accounting Policies (Tables)

12 Months Ended

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
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

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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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

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Tabular disclosure of the components of cash and cash equivalents.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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