6. Warrant Activity (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Weighted average remaining contract term
Weighted average remaining contract term, Outstanding at end of period	8 years 4 months 24 days
Warrant Share [Member]
Number of Shares
Number of Shares, Outstanding at beginning of period	3,046,801
Number of Shares, Granted	0
Number of Shares, Exercised	0
Number of Shares, Forfeited and canceled	0
Number of Shares, Outstanding at end of period	3,046,801
Number of Shares, Exercisable at end of period	3,046,801
Weighted average exercise price
Weighted average exercise price, Outstanding at beginning of period	4.08
Weighted average exercise price, Granted
Weighted average exercise price, Exercised
Weighted average exercise price, Forfeited and canceled
Weighted average exercise price, Outstanding at end of period	4.08
Weighted average exercise price, Exercisable at end of period	4.08
Weighted average remaining contract term
Weighted average remaining contract term, Outstanding at end of period	1 year 11 months 16 days
Weighted average remaining contract term, Exercisable at end of period	1 year 11 months 16 days
Intrinsic Value
Intrinsic Value, Outstanding at end of period	0
Intrinsic Value, Exercisable at end of the period	0