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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Taxes [Line Items]
Income tax benefit (provision)	$ 416,000	$ (384,000)	$ (905,000)	$ (427,000)
United States [Member] | Revised International Corporate Structure [Member]
Income Taxes [Line Items]
Income tax benefit (provision)	400,000		(900,000)
United States [Member] | Research and Management Services Arrangements [Member]
Income Taxes [Line Items]
Income tax benefit (provision)		(400,000)		(400,000)
Japan [Member]
Income Taxes [Line Items]
Income tax benefit (provision)	0	0	0	0
Singapore [Member]
Income Taxes [Line Items]
Income tax benefit (provision)	0	0	0	0
Ireland [Member]
Income Taxes [Line Items]
Income tax benefit (provision)	0	0	0	0
United Kingdom [Member]
Income Taxes [Line Items]
Income tax benefit (provision)	$ 0	$ 0	$ 0	$ 0

X

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: 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.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Income Taxes [Line Items]

+ References

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