Commitments and Contingencies - Additional Information (Detail)		12 Months Ended
	Sep. 21, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€)	Sep. 30, 2015 USD ($)
Operating Leased Assets [Line Items]
Fair value of contingent consideration		$ 23,500,000
Supply Commitment [Member]
Operating Leased Assets [Line Items]
Commitments under Robotic Agreement		$ 400,000
Corporate offices [Member]
Operating Leased Assets [Line Items]
Lease expiration date		Jun. 30, 2018
Operating lease agreement period		5 years
Operating lease amended extension period		3 years 2 months
Operating lease, renew option period		3 years
Warehouse [Member]
Operating Leased Assets [Line Items]
Operating lease agreement period		4 years 4 months
Operating lease additional renewed period		6 years
Operating leases, rent expense		$ 513,000	$ 424,000	$ 360,000
Office Building [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense		$ 0	89,000	55,000
Shareholder [Member] | Office Building [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense			89,000	48,000
Royalty Agreement Terms [Member]
Operating Leased Assets [Line Items]
Percentage of royalty paid for one to three years		1.50%
Percentage of royalty paid for four to seven years		4.00%
Royalty payment period		10 years
Royalty expense		$ 0	$ 0	0
Manufacturing Facility [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense				$ 55,000
Manufacturing facility leased period				1 year
Microline [Member]
Operating Leased Assets [Line Items]
Amount due in milestone fees for contract development		1,000,000
ALF-X Surgical Robotic System Acquisition [Member]
Operating Leased Assets [Line Items]
Fair value of contingent consideration	$ 23,900,000	$ 400,000
ALF-X Surgical Robotic System Acquisition [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Aggregate milestone payments | €					€ 27,500,000
ALF-X Surgical Robotic System Acquisition [Member] | License and Supply Agreements [Member]
Operating Leased Assets [Line Items]
Commitments under agreements, in 2016						$ 730,000
Commitments under agreements, in 2017						654,000
Commitments under agreements, in 2018						872,000
Commitments under agreements, in 2019						872,000
Commitments under agreements, in 2020						545,000
Commitments under agreements, thereafter until termination in 2027						$ 3,800,000