Number of trading period.

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Service agreement termination year.

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No definition available.

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Number of shares of equity interests issued or issuable to acquire entity.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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- Definition

Fair value of equity issued in a business combination.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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No definition available.

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Related Person Transactions - Additional Information (Detail) $ / shares in Units, € in Millions				6 Months Ended		12 Months Ended
	Jan. 04, 2017 EUR (€) shares	Dec. 30, 2016 EUR (€) shares	Sep. 21, 2015 shares	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jan. 04, 2017 $ / shares
Related Party Transaction [Line Items]
Fair value of contingent consideration				$ 13,462,000		$ 12,418,000
Senhance Surgical Robotic System Acquisition [Member]
Related Party Transaction [Line Items]
Reduction of contingent consideration				1,400,000	$ 500,000
Common shares issued \| shares			15,543,413
Fair value of contingent consideration				13,500,000		$ 12,400,000
Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member]
Related Party Transaction [Line Items]
Reduction of contingent consideration \| €		€ (5.0)
Common shares issued \| shares		3,722,685
Aggregate fair market value of common stock \| €		€ 5.0
Fair value of contingent consideration \| €	€ 5.0
Share price \| $ / shares							$ 1.404
Number of consecutive trading days	10 days
Sofar [Member]
Related Party Transaction [Line Items]
Expenses for administrative services with related party				$ 0	$ 52,000
Service agreement termination period				2017
Sofar [Member] \| Senhance Surgical Robotic System Acquisition [Member] \| Second Tranche [Member]
Related Party Transaction [Line Items]
Common shares issued \| shares	3,722,685
Sofar [Member] \| Common Stock [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners				9.00%	13.00%
1Med S.A [Member] \| Service Supply Agreement [Member]
Related Party Transaction [Line Items]
Expenses incurred under related party transactions				$ 18,000