Estimated fair value of warrant liability.

No definition available.

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- Definition

Fair value, assets transfers between Level 1, Level 2 and Level 3, amount.

+ References

No definition available.

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- Definition

Fair value, liabilities transfers between Level 1, Level 2 and Level 3, amount.

+ References

No definition available.

+ Details

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- Definition

Fair value measurements disclosure.

+ References

No definition available.

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- Definition

Warrant expiration date.

+ References

No definition available.

+ Details

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

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- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Fair Value - Additional Information (Detail)		3 Months Ended		6 Months Ended
Fair Value - Additional Information (Detail)	Apr. 28, 2017 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares
Fair Value Measurements Disclosure [Line Items]
Transfers of assets between Level 1, Level 2, and Level 3 of the fair value hierarchy		$ 0		$ 0		$ 0
Transfers of liabilities between Level 1, Level 2, and Level 3 of the fair value hierarchy		0		0		0
Warrants to purchase common shares \| shares	24,900,000
Offering price \| $ / shares	$ 1.00
Change in fair value of warrant liabilities		17,507,000	$ 2,326,000	15,678,000	$ 2,326,000
Series A Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Warrants, exercise price \| $ / shares	$ 1.00
Warrant expiration date	Oct. 31, 2017
Series A Warrant [Member] \| Black-Scholes Merton Model [Member]
Fair Value Measurements Disclosure [Line Items]
Estimated fair value of warrants	$ 2,500,000
Fair value input, share price \| $ / shares	$ 0.65
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Expected Term [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, term	1 year
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	0.0107
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Expected Dividend Payment [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	0.00
Series A Warrant [Member] \| Black-Scholes Merton Model [Member] \| Measurement Input, Price Volatility [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	0.7314
Series B Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Warrants, exercise price \| $ / shares	$ 1.00
Estimated fair value of warrants	$ 6,200,000	$ 22,700,000		$ 22,700,000		$ 14,100,000
Fair value input, share price \| $ / shares	$ 0.65	$ 4.36		$ 4.36		$ 1.93
Series B Warrant [Member] \| Measurement Input, Expected Term [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, term	5 years	3 years 9 months 29 days		3 years 9 months 29 days		4 years 3 months 29 days
Series B Warrant [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	1.81	2.67		2.67		2.13
Series B Warrant [Member] \| Measurement Input, Price Volatility [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value input, risk free rate	73.14	88.50		88.50		80.60
Common Stock [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit \| shares	1
Common Stock [Member] \| Series A Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit \| shares	1
Common Stock [Member] \| Series B Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit \| shares	0.75
Senhance Surgical Robotic System Acquisition [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value of contingent consideration				$ 1,400,000	$ 500,000