SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of estimated useful lives of assets

Depreciation of property and equipment is calculated using the straight-line method over the estimated useful lives of the assets, as follows:



Computer equipment		3 years
Office and other equipment		6 years
Laboratory equipment		6 years
Leasehold improvements		The lesser of the lease term or the life of the asset

Schedule of potentially dilutive securities not included in the calculation of diluted net loss per share because to do so would be anti-dilutive

The following table presents the weighted average number of potentially dilutive securities not included in the calculation of diluted net loss per share due to the anti-dilutive effect of the securities:



	Year ended
	December 31,
	2017	2016	2015
Common stock options	38,675	173,776	582,662
Common stock warrants	7,534,576	315,834	1,546,201
Total	7,573,251	489,610	2,128,863