Fair Value Measurement - Additional Information (Detail)			1 Months Ended	3 Months Ended
	Mar. 26, 2015 shares	Mar. 02, 2015 shares	Sep. 30, 2014 USD ($) $ / shares shares	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Fair Value Measurement Details [Line Items]
Stock Issued During Period, Shares, New Issues | shares	500,000	18,700,000
Derivative expiration date				Mar. 30, 2015
Assets, Fair Value Disclosure, Nonrecurring				$ 0	$ 0
Liabilities, Fair Value Disclosure, Nonrecurring				0	0
Derivative Financial Instruments, Liabilities [Member]
Schedule of Fair Value Measurement Details [Line Items]
Change in fair value				11,000
Common Stock [Member] | Common Stock for Construction in Progress Assets [Member] | HPL [Member]
Schedule of Fair Value Measurement Details [Line Items]
Stock Issued			$ 3,300,000
Share Price | $ / shares			$ 1.10
Stock Issued During Period, Shares, New Issues | shares			3,000,000
Stock Issuance, Adjustment Threshold, Volume Weighted Average Price | $ / shares			$ 1.00
Stock Issuance, Adjustment Threshold trading days			5
Stock, Issuance, Minimum Value			$ 3,000,000
Fair Value, Inputs, Level 2 [Member]
Schedule of Fair Value Measurement Details [Line Items]
Convertible Debt, Fair Value Disclosures				$ 40,551,000	$ 39,423,000