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Related Parties - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Third-Party Investor [Member]
Related Party Transaction [Line Items]
Related party transaction amount			$ 109		$ 118
Shin Nippon Biomedical Laboratories Ltd. (“SNBL”) [Member]
Related Party Transaction [Line Items]
Payment for contract research services	$ 83	$ 4	$ 161	$ 329
Scientific Advisor [Member] | Consulting Agreement [Member]
Related Party Transaction [Line Items]
Consulting agreement termination notice period			14 days
Consulting service expenses			$ 13

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- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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

+ References

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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