Stock-based Activity (Detail 1) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Shares Issuable Under Options
Options Outstanding, Outstanding at beginning of period	242,893
Options Granted	3,015,850
Options Exercised	(2,779)	0
Options Forfeited/cancelled/expired	(12,923)
Options Outstanding and expected to vest at end of period	3,243,041
Options Vested and exercisable at September 30, 2015	170,063
Weighted Average Exercise Price
Weighted-Average Exercise Price, Outstanding at beginning of period	$ 3.92
Weighted-Average Exercise Price, Granted	2.23
Weighted-Average Exercise Price, Exercised	.29
Weighted-Average Exercise Price, Forfeited/cancelled/expired	7.42
Weighted-Average Exercise Price, Outstanding and expected to vest at end of period	2.36
Weighted-Average Exercise Price, Vested and exercisable at September 30, 2015	$ 3.60