Note 9. Share-Based Payments (Detail) - Stock Option (USD $)	0 Months Ended	9 Months Ended
	Dec. 31, 2011	Sep. 30, 2012
Options outstanding at December 31, 2011	4,418,602
Options outstanding at December 31, 2011 (in Dollars per share)	$ 4.77
Options outstanding at December 31, 2011	7 years 58 days	6 years 255 days
Granted		100,000
Granted (in Dollars per share)		$ 0.35
Forfeited		(1,925,704)
Forfeited (in Dollars per share)		$ 5.31
Expired		(40,032)
Expired (in Dollars per share)		$ 19.86
Options outstanding at September 30, 2012		2,552,866
Options outstanding at September 30, 2012 (in Dollars per share)		$ 3.95
Options outstanding at September 30, 2012	7 years 58 days	6 years 255 days
Vested or expected to vest at September 30, 2012		2,475,337
Vested or expected to vest at September 30, 2012 (in Dollars per share)		$ 4.04
Vested or expected to vest at September 30, 2012		6 years 51 days
Options exercisable at September 30, 2012		1,780,385
Options exercisable at September 30, 2012 (in Dollars per share)		$ 5.19
Options exercisable at September 30, 2012		6 years 51 days