Net Loss Per Common Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Potential Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Common Share

The following potential common stock equivalents were not included in the calculation of diluted net loss per common share because the inclusion thereof would be antidilutive.

	Three and Six Months Ended
	June 30,
	2018		2017
Outstanding stock options		385,974		1,012,833
Unvested restricted stock		956,247		1,524,058
Total		1,342,221		2,536,891