Goodwill, In-Process Research and Development and Intangible Assets - Additional Information (Detail) - USD ($)		3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 21, 2015	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2009
Goodwill And Intangible Assets [Line Items]
Goodwill			$ 69,948,000		$ 130,869,000
Goodwill impairment		$ 61,800,000	61,784,000		0
In-process research and development			16,972,000		16,511,000
Patent purchased amount			53,500,000		53,500,000
Write-off of intellectual property			1,562,000
In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development			16,972,000		16,511,000
Discount rate	45.00%
Patents [Member]
Goodwill And Intangible Assets [Line Items]
Patent purchased amount			5,000,000		$ 5,000,000	$ 5,000,000
Write-off of intellectual property			1,562,000
Patents [Member] | SurgiBot System [Member]
Goodwill And Intangible Assets [Line Items]
Write-off of intellectual property			1,600,000	$ 0
Intellectual Property [Member]
Goodwill And Intangible Assets [Line Items]
Discount rate	45.00%
Safe Stitch Medical Inc [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill			93,800,000
Senhance Surgical Robotic System Acquisition [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 38,348,000		$ 38,300,000
Intellectual property	48,500,000
Senhance Surgical Robotic System Acquisition [Member] | In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development	$ 17,100,000