Annual report pursuant to Section 13 and 15(d)

Summary of Warrant Activity (Detail)

v3.3.1.900
Summary of Warrant Activity (Detail) - Warrants - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shares      
Beginning Balance 10,093,836 1,697,974 852,974
Granted 0 9,205,862 1,025,000
Exercised 0 (200,000) (105,000)
Forfeited, cancelled, or expired 0 (610,000) (75,000)
Ending Balance 10,093,836 10,093,836 1,697,974
Warrants exercisable at December 31, 2015 9,958,836    
Vested warrants expired during the 12 months ended December 31, 2015 0    
Weighted Average Exercise Price      
Beginning Balance $ 4.18 $ 5.44 $ 5.84
Granted   4.00 4.65
Exercised   2.00 2.12
Forfeited, cancelled, or expired   5.71 3.83
Ending Balance 4.18 $ 4.18 $ 5.44
Warrants exercisable at December 31, 2015 $ 4.18