Closing of 2013 Merger and Financing Transaction - Schedule of Allocation of Purchase Price to Net Assets Acquired (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 03, 2013
Business Acquisition [Line Items]
Goodwill	$ 130,869	$ 93,842	$ 93,842
Safe Stitch Medical Inc [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	$ 93,800			93,842
Total assets acquired				94,793
Accounts payable and other liabilities				642
Net assets acquired				$ 94,151