Net Loss Per Common Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Outstanding Securities Excluded from Computation of Diluted Loss Per Share

Outstanding securities excluded from the calculation of diluted loss per share for the three months ended March 31, 2018 and 2017 are shown in the chart below:

	Three Months Ended March 31,
(in thousands)	2018		2017
Outstanding options to purchase common stock		2,037		1,652
Conversion of the Convertible Notes		—		1,216