Goodwill, In-Process Research and Development and Intangible Assets - Additional Information (Detail) - USD ($)	Sep. 21, 2015	Sep. 30, 2015
Goodwill And Intangible Assets [Line Items]
Accumulated impairment losses on goodwill		$ 0
In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development		$ 22,197,000
Discount rate	50.00%
Intellectual Property [Member]
Goodwill And Intangible Assets [Line Items]
Discount rate	45.00%
ALF-X Surgical Robotic System Acquisition [Member]
Goodwill And Intangible Assets [Line Items]
Intellectual property	$ 62,500,000
ALF-X Surgical Robotic System Acquisition [Member] | In-Process Research and Development [Member]
Goodwill And Intangible Assets [Line Items]
In-process research and development	$ 22,300,000