Company's Stock Option Activities (Detail) (USD $)	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Jun. 08, 2012	Jul. 22, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Outstanding Opening, Weighted-Average Exercise Price Per Share	$ 0.50	$ 0.55	$ 0.56	$ 0.68	[1]	$ 0.91	[1]
Granted, Weighted-Average Exercise Price Per Share	$ 0.28	$ 0.28	$ 0.46	$ 0.48	[1]	$ 0.49	[1]
Exercised, Weighted-Average Exercise Price Per Share					[1]		[1]		[1]
Forfeited, Weighted-Average Exercise Price Per Share	$ 0.72	$ 0.64	$ 1.10	$ 0.42	[1]	$ 0.39	[1]
Outstanding Ending, Weighted-Average Exercise Price Per Share	$ 0.45	$ 0.50	$ 0.55	$ 0.71	[1]	$ 0.68	[1]	$ 0.91	[1]
Outstanding			5,171,500	525,868	[1]					400,000	400,000
Granted, Shares	1,195,000	750,000	675,000	190,000	[1]	3,700,000	[1]
Exercised, Shares					[1]		[1]		[1]
Forfeited, Shares	(176,625)	(830,000)	(23,000)	(420,000)	[1]	(650,000)	[1]
Outstanding Ending, Shares	6,761,875	5,743,500	5,823,500	5,300,175	[1]	5,530,175	[1]	2,480,175	[1]

[1] As recast to reflect the activity of SGT beginning January 1, 2011 combined with the balances of Solar Power, Inc. beginning March 31, 2011, as required under the accounting guidelines for a transfer of an entity under common control (refer to Note 4-Acquisition of Solar Green Technology).