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Organization - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 01, 2017	Feb. 28, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Organization And Basis Of Presentation [Line Items]
Unrestricted cash and cash equivalents			$ 10,541	$ 4,182	$ 14,753	$ 18,902
Accumulated deficit			(159,429)	$ (155,946)
Working capital			$ 6,619
Subsequent Event [Member] | BTIG LLC [Member]
Organization And Basis Of Presentation [Line Items]
Sale of stock, number of shares sold in transaction	645,271
Proceeds from sale of common stock	$ 2,211
Registered Direct Offering [Member]
Organization And Basis Of Presentation [Line Items]
Proceeds from sale of common stock		$ 7,598
At the Market Offering [Member] | BTIG LLC [Member]
Organization And Basis Of Presentation [Line Items]
Sale of stock, number of shares sold in transaction			538,427
Proceeds from sale of common stock			$ 2,104
Second Purchase Agreement [Member] | Registered Direct Offering [Member]
Organization And Basis Of Presentation [Line Items]
Sale of stock, number of shares sold in transaction		2,950,000
Proceeds from sale of common stock		$ 7,598

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-Publisher FASB
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