Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

11. Selected Quarterly Financial Data (Unaudited) (In thousands, except per share amounts)

	Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	2016		2016		2016		2016
Loss from operations	$	(10,581)	$	(9,311)	$	(9,156)	$	(10,204)
Net loss	$	(11,078)	$	(5,764)	$	(8,489)	$	(2,472)
Net loss per share – basic	$	(0.12)	$	(0.06)	$	(0.09)	$	(0.02)
Net loss per share – dilutive	$	(0.12)	$	(0.10)	$	(0.09)	$	(0.02)
Weighted average common share – basic		90,826,752		91,015,733		91,441,687		103,804,308
Weighted average common share – dilutive		90,826,752		93,930,540		91,441,687		103,804,308

	Quarter Ended
	March 31, 2015		June 30, 2015		September 30, 2015		December 31, 2015
Loss from operations	$	(8,207)	$	(9,730)	$	(11,650)	$	(11,393)
Net loss	$	(12,359)	$	(13,623)	$	(7,507)	$	(11,296)
Net loss per share – basic	$	(0.17)	$	(0.19)	$	(0.08)	$	(0.12)
Net loss per share – dilutive	$	(0.17)	$	(0.19)	$	(0.12)	$	(0.12)
Weighted average common share – basic		72,673,959		72,736,829		85,974,751		90,810,629
Weighted average common share – dilutive		72,673,959		72,736,829		87,585,103		90,810,629