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Common Stock - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended
	Feb. 03, 2017	Jan. 27, 2017	Feb. 28, 2017	Mar. 31, 2017	Mar. 17, 2017	Dec. 31, 2016
Temporary Equity [Line Items]
Proceeds from stock subscriptions				$ 108,000		$ 206,000
Registered Direct Offering [Member]
Temporary Equity [Line Items]
Payment of commissions and other issuance cost			$ 727,000
Proceeds from sale of common stock			$ 7,598,000
Registered Direct Offering [Member] | Securities Purchase Agreement [Member]
Temporary Equity [Line Items]
Sale of stock, number of shares sold in transaction	950,000	2,000,000
Sale of stock, price per share	$ 3.50	$ 2.50
At the Market Offering [Member] | BTIG LLC [Member]
Temporary Equity [Line Items]
Sale of stock, number of shares sold in transaction				538,427
Proceeds from sale of common stock				$ 2,104,000
Fixed commission rate entitled to placement agent				3.00%
Average selling price of common stock				$ 4.04
Gross proceeds from sale of shares				$ 2,175,000
Proceeds from stock subscriptions				$ 108,000
At the Market Offering [Member] | BTIG LLC [Member] | Maximum [Member]
Temporary Equity [Line Items]
Aggregate offering on sale of common stock					$ 11,000,000

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Amount of subscription receivable from investors who have been allocated common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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