Closing of Merger and Financing Transaction - Schedule of Allocation of Purchase Price to Net Assets Acquired (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Sep. 03, 2013
Business Acquisition [Line Items]
Goodwill	$ 93,842	$ 93,842
Merger Agreement [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 597
Accounts receivable			54
Inventory			50
Other current assets			53
Property and equipment			185
Other long-term asset			2
Intangible assets			10
Goodwill			93,842
Total assets acquired			94,793
Accounts payable and other liabilities			642
Total purchase price			$ 94,151