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.

+ Details

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- Definition

Fair value inputs, probability of additional financing next twelve months.

+ References

No definition available.

+ Details

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- Definition

Fair value inputs, probability of additional financing year two.

+ References

No definition available.

+ Details

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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.

+ Details

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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/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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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Period Type:	instant

- 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://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

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- Definition

Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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Period Type:	instant

- Details

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- Details

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Fair Value - Additional Information (Detail) - USD ($)		3 Months Ended			12 Months Ended
Fair Value - Additional Information (Detail) - USD ($)	Apr. 28, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 10, 2015	Jun. 11, 2015
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
Fair value of contingent consideration							$ 23,900,000
Warrants to purchase common shares	24,900,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001			$ 0.001	$ 0.001
Offering price	1.00							$ 3.00	$ 3.00
Change in fair value of warrant		$ 58,521,000	$ 22,887,000	$ 2,326,000	$ 83,734,000
Series A Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Warrants, exercise price	$ 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, term	1 year
Fair value input, risk free rate	1.07%
Fair value input, dividends	$ 0
Fair value input, volatility	73.14%
Fair value input, share price	$ 0.65
Series B Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Warrants, exercise price	$ 1.00	$ 1.00			$ 1.00
Series B Warrant [Member] \| Black-Scholes Merton Model [Member]
Fair Value Measurements Disclosure [Line Items]
Estimated fair value of warrants	$ 6,200,000
Fair value input, term	5 years
Fair value input, risk free rate	1.81%
Fair value input, dividends	$ 0
Fair value input, volatility	73.14%
Fair value input, share price	$ 0.65
Series B Warrant [Member] \| Monte Carlo Valuation Model [Member]
Fair Value Measurements Disclosure [Line Items]
Estimated fair value of warrants		$ 14,100,000			$ 14,100,000
Fair value input, term					4 years 3 months 29 days
Fair value input, risk free rate					2.13%
Fair value input, volatility					80.60%
Fair value input, share price		$ 1.93			$ 1.93
Probability of additional financing in 2018					25.00%
Probability of additional financing in 2019					75.00%
Common Stock [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit	1
Common Stock [Member] \| Series A Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit	1
Warrants, exercise price	$ 1.00
Common Stock [Member] \| Series B Warrant [Member]
Fair Value Measurements Disclosure [Line Items]
Number of common stock or warrants in each unit	0.75
Warrants, exercise price	$ 1.00
Senhance Surgical Robotic System Acquisition [Member]
Fair Value Measurements Disclosure [Line Items]
Fair value of contingent consideration					$ 2,000,000	$ 500,000