Loss per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended				38 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013
Numerator
Net loss attributable to Prospect Global Resources Inc.	$ (15,581)		$ (13,945)		$ (14,047)		$ (17,266)		$ (145,624)
Undeclared Preferred Stock Dividends	(160)				(160)				(160)
Net loss applicable to common shares for basic and diluted earnings per share	$ (15,741)		$ (13,945)		$ (14,207)		$ (17,266)		$ (145,784)
Denominator
Weighted average number of common shares outstanding - basic	2,737,000		1,094,000		2,124,000		943,000		1,169,000
Weighted average number of common shares outstanding - fully diluted	2,737,000		1,094,000		2,124,000		943,000		1,169,000
Basic and fully diluted loss per share of common stock (in dollars per share)	$ (5.75)	[1]	$ (12.74)	[1]	$ (6.69)	[1]	$ (18.31)	[1]	$ (124.71)	[1]
Antidilutive potentially dilutive warrants and options which were not included in the computation of Loss Per Share (in shares)					7,386,907

[1] All common share amounts and computations using such amounts have been retroactively adjusted to reflect the September 4, 2013 1-for-50 reverse stock split.