Net Loss Per Common Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule of Securities Excluded from Computation of Diluted Loss Per Share

Securities excluded from the calculation of diluted loss per share are shown in the chart below:

	Years Ended December 31,
(in thousands)	2016		2015		2014
Common stock warrants		—		—		238
Outstanding options to purchase common stock		1,903		1,921		1,957
Conversion of the Convertible Notes		1,216		2,500		2,500