Goodwill, In-Process Research and Development and Intangible Assets - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 21, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2009
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 69,756,000		$ 69,756,000		$ 130,869,000
Goodwill impairment		61,784,000		61,784,000		0
In-process research and development		16,811,000		16,811,000		16,511,000
Patent purchased amount		53,500,000		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		16,811,000		16,811,000		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	$ 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	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		93,800,000
ALF-X Surgical Robotic System Acquisition [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 38,348,000	$ 38,300,000		$ 38,300,000
Intellectual property	48,500,000
ALF-X 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