Closing of Merger and Financing Transaction - Schedule of Purchase Price (Detail) - USD ($) $ / shares in Units, $ in Thousands	Sep. 03, 2013	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2014	Mar. 30, 2014
Business Acquisition [Line Items]
Common shares outstanding at the date of Merger		82,481,722	63,182,806	48,855,255	244,276,923
Merger Agreement [Member]
Business Acquisition [Line Items]
Common shares outstanding at the date of Merger	12,350,000
Closing price per share	$ 7.60
Equity consideration	$ 93,858
Cash consideration	293
Total purchase price	$ 94,151