Weighted Average Common Shares Excluded from Dilutive EPS Calculation (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Excluded Securities:
Total	1,148,679	68,991,793	600,451	68,779,184
Stock Options
Excluded Securities:
Total	1,148,679	8,566,158	600,451	8,353,549
Convertible Preferred Stock
Excluded Securities:
Total		58,905,918		58,905,918
Common stock warrants
Excluded Securities:
Total		1,519,717		1,519,717