Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 1,192
Operating expenses:
Research and development	4,651	$ 9,770
General and administrative	3,587	3,118
Gain on asset sale	(1,500)
Total operating expenses	6,738	12,888
Other income (expense):
Interest income	33	16
Interest expense	(797)	(663)
Other expense	(29)	(7)
Total other expense, net	(793)	(654)
Net loss attributable to common stockholders	$ (6,339)	$ (13,542)
Net loss per share attributable to common stockholders:
Basic and diluted	$ (0.22)	$ (0.49)
Weighted-average common shares outstanding:
Basic and diluted	29,019,582	27,362,643

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

No definition available.