Capital Structure - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended	2 Months Ended	1 Months Ended
	Apr. 16, 2014	Apr. 14, 2014	Aug. 31, 2008	Mar. 31, 2015	Sep. 30, 2013	Dec. 31, 2010	Nov. 30, 2009	Aug. 31, 2011	Dec. 31, 2014	Dec. 31, 2013
Conversion of Stock [Line Items]
Business acquisition, merger agreement date				Apr. 16, 2014
Exchanged number of common stock	3,946,701
Common stock, voting rights				The class B restricted voting shares are convertible into voting common shares on a one-for-one basis at the option of the holder thereof at any time after July 15, 2014.
Number of shares issued on Private placement	6,125,000
Common stock price per share	$ 3.64
Private placement offering of equity securities aggregate gross proceeds	$ 22,273,000
Percentage of placement agent fee	6.00%
Cash commissions and other expenses paid to private placement	1,522,000
Percentage of purchase price common stock shares	6.00%
Number of exercisable option shares sold in offering	367,500
Exercise option price per share	$ 3.64
Stock option expected term	2 years			4 years 6 months
Percentage of volatility rate	87.00%
Expected term of stock option	2 years
Stock option exercisable period	2 years
Legal, accounting and printing fees	1,128,000
Common stock, shares issued			14,683
Stock split, conversion ratio		0.6420084
Stock Split, conversion basis				On April 14, 2014, each of the 20,000,075 shares of WPHI common stock issued and outstanding were automatically combined, reclassified and changed into 0.6420084 of one fully paid and non-assessable common shares resulting in a post-split total of 12,840,187 shares, without any action on the part of the holder thereof.
Reverse stock split				1 for 11.6087
Reverse stock split approval date				Sep. 10, 2013
Effective date of stock split				Sep. 16, 2013
Common stock, shares, issued	629,061				6,400,000
Addition to convertible notes outstanding	3,634,000				5,250,000
Value of preferred stock converted into common stock				50,000,000
Preferred stock, shares authorized				6,000,000
Proceeds from issuance of stock			17,700,000
Warrant to purchase preferred stock, exercise price								$ 0.50
Convertible Notes [Member]
Conversion of Stock [Line Items]
Convertible notes, interest rate				6.00%
Convertible notes maturity date				Jun. 30, 2014
Aggregate proceeds from equity financing				10,000,000
Aggregate principal amount of convertible notes percentage				60.00%
Mira III [Member]
Conversion of Stock [Line Items]
Common stock, shares outstanding	359,375
Stock option outstanding	43,125
Wind Power Holdings Inc [Member]
Conversion of Stock [Line Items]
Common stock, shares outstanding	12,840,187								0
Exchanged number of common stock	1,016,534
Conversion of senior secured convertible notes to common stock	12,320,000
Common stock, shares authorized										44,000,000
Common stock, par value										$ 0.01
Minimum [Member]
Conversion of Stock [Line Items]
Investors rights percentage				50.00%
Common Stock Options [Member]
Conversion of Stock [Line Items]
Options fair value	$ 620
Reverse Take Over [Member]
Conversion of Stock [Line Items]
Common stock, shares outstanding									22,764,353
Common stock, no par value
Common stock value				133,963,000
Common stock, shares issued									22,764,353
Reverse Stock Split [Member] | Wind Power Holdings Inc [Member]
Conversion of Stock [Line Items]
Common stock, shares outstanding		20,000,075
Common stock, shares issued		20,000,075
Post Stock Split [Member]
Conversion of Stock [Line Items]
Common stock, shares outstanding				12,840,187
Common stock, shares issued				12,840,187
Mira III [Member]
Conversion of Stock [Line Items]
Common stock, no par value				$ 0
Reduction in APIC	(1,410,000)			1,410,000
Class B Restricted Voting Common Shares [Member]
Conversion of Stock [Line Items]
Exchanged number of common stock	8,893,486
Common stock, shares, issued	1,678,786
Class B Restricted Voting Common Shares [Member] | Wind Power Holdings Inc [Member]
Conversion of Stock [Line Items]
Exchanged number of common stock	2,368,221
Class B Restricted Voting Common Shares [Member] | Reverse Take Over [Member]
Conversion of Stock [Line Items]
Common stock, shares outstanding									0
Common stock, shares issued									0
Series X-1 Preferred Stock [Member]
Conversion of Stock [Line Items]
Preferred stock, shares authorized				3,000,000
Series X-2 Preferred Stock [Member]
Conversion of Stock [Line Items]
Preferred stock, shares authorized				3,000,000
Series A Preferred Stock [Member]
Conversion of Stock [Line Items]
Preferred stock, shares issued			3,540,000
Series B Preferred Stock [Member]
Conversion of Stock [Line Items]
Preferred stock, shares issued						2,121,707	7,286,232
Preferred stock, per share							$ 6.00
Proceeds from issuance of preferred stock						12,730,000	43,532,000
Stock issuance costs							185,000
Series C-2 Convertible Preferred Stock [Member]
Conversion of Stock [Line Items]
Preferred stock, per share								$ 6.30
Warrants to purchase shares								6,433,288
Series C-2 Convertible Preferred Stock [Member] | Convertible Preferred Stock Warrants [Member]
Conversion of Stock [Line Items]
Stock issuance costs								115,000
Aggregate cash consideration								$ 10,016,000
Convertible Series C-1 Preferred Stock [Member]
Conversion of Stock [Line Items]
Conversion feature description				Upon the closing of the September offering, the shares of the Company's formerly outstanding Series C-1 preferred stock held by investors participating in this note financing were converted into additional notes at the rate of one dollar face amount of convertible note for every three dollars in liquidation preference of Series C-1 preferred stock.
Preferred stock, shares issued								1,608,322
Preferred stock, per share								$ 6.30
Series X Preferred Stock [Member]
Conversion of Stock [Line Items]
Stock option expiration date				Apr. 16, 2014