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Net Loss Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Net Loss Per Share	9. Net Loss Per Share Basic net loss per share of common stock is computed based upon the number of weighted average shares of common stock outstanding as defined by ASC Topic 260, Earnings Per Share. Diluted net loss per share of common stock includes the dilutive effects of stock options and stock equivalents. To the extent stock options are antidilutive, they are excluded from the calculation of diluted net loss per share of common stock. For the nine months ended September 30, 2018, 1,067,527 shares upon the exercise of outstanding stock options and 158,571 shares of unvested restricted stock were not included in the computation of diluted net loss per share because their inclusion would be antidilutive.  For the three and nine months ended September 30, 2017, 817,020 shares upon the exercise of outstanding stock options and 264,286 shares of unvested restricted stock were not included in the computation of diluted net loss per share because their inclusion would be antidilutive.

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- Definition

The entire disclosure for earnings per share.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-URI http://asc.fasb.org/topic&trid=2144383

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