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Common Stock - Additional Information (Detail) $ / shares in Units, $ in Thousands							1 Months Ended		3 Months Ended					9 Months Ended		12 Months Ended
	Apr. 08, 2019 USD ($) $ / shares shares	Feb. 12, 2019 USD ($) $ / shares shares	Feb. 04, 2019 $ / shares shares	Feb. 04, 2019 $ / shares shares	Apr. 04, 2018 USD ($) shares	Apr. 03, 2018 USD ($) $ / shares shares	Jan. 31, 2019 $ / shares shares	Apr. 30, 2018 USD ($) shares	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 shares	Mar. 31, 2019 USD ($) shares	Jun. 30, 2018 shares	Mar. 31, 2018 shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Aug. 12, 2019	Feb. 03, 2019 $ / shares
Temporary Equity [Line Items]
Sale of stock, number of shares sold in transaction \| shares		1,706,484
Common stock, par value \| $ / shares									$ 0.0001					$ 0.0001		$ 0.0001
Average selling price of common stock \| $ / shares		$ 1.465
Number of shares issued and sold \| shares									370,000
Number of warrants exercised \| shares								15,000						8,947,112
Issuance of common stock shares \| shares									797,334					797,334
Proceeds from Issuance of Warrants														$ 157	$ 78
Class of Warrant or Right Issued \| shares		110,922
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 1.8313	$ 2.125	$ 2.125			$ 2.125		$ 7.50					$ 7.50
Proceeds from Issuance of Common Stock		$ 2,500
Class of Warrant or Right, Date from which Warrants or Rights Exercisable														Jan. 26, 2024
Proceeds from Issuance of Common Stock and Warrants														$ 17,545	$ 16,286
Class of warrant or right fair value per warrant																	0.5314%
Estimate of Fair Value Measurement [Member]
Temporary Equity [Line Items]
Class of warrant or right fair value per warrant									1.2362%					1.2362%
Underwriting Agreement [Member]
Temporary Equity [Line Items]
Payment of commissions and other issuance cost														$ 1,904		$ 1,497
Proceeds from sale of common stock														$ 14,517
Underwriting Agreement [Member] \| Estimate of Fair Value Measurement [Member]
Temporary Equity [Line Items]
Class of warrant or right fair value per warrant	0.997%
Investor [Member]
Temporary Equity [Line Items]
Stock issued during period, shares \| shares		1,706,484
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 1.34							$ 1.34					$ 1.34
Class of warrant or right fair value per warrant		0.5962%
Warrant [Member]
Temporary Equity [Line Items]
Payment of commissions and other issuance cost											$ 691			$ 2,595
Proceeds from sale of common stock											$ 3,049			$ 17,702
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares									$ 83.50					$ 83.50
Proceeds from Warrant Exercises									$ 70
Gross Proceeds Up To Five Thousand [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Commission rate on sale of stock														7		7
Gross Proceeds In Excess Of Five Thousand [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Commission rate on sale of stock														6.5
Series A Warrant [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares									$ 6.50					$ 6.50
Prefunded Warrants Issued [Member] \| Warrant [Member]
Temporary Equity [Line Items]
Class of Warrant or Right Issued \| shares									697,500
Common Stock [Member]
Temporary Equity [Line Items]
Number of shares issued and sold \| shares										3,319,553	2,394,955	1,681,000	123,266
Common Stock [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Common stock, par value \| $ / shares	$ 0.0001
Number of shares \| shares	1
Common Units [Member]
Temporary Equity [Line Items]
Proceeds from sale of common stock	$ 16,557				$ 15,944
Proceeds from Issuance of Warrants	$ 8,647,112
Common Units [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Proceeds from sale of common stock						$ 15,197
Average selling price of common stock \| $ / shares	$ 1.35					$ 6.50
Number of shares issued and sold \| shares	1,719,554					1,566,000
Common Units [Member] \| Common Stock [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Common stock, par value \| $ / shares																		$ 0.0001
Prefunded Units [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Average selling price of common stock \| $ / shares	$ 1.34					$ 6.40
Number of shares issued and sold \| shares	8,947,112					784,000								8,647,112
Number of warrants exercised \| shares														8,647,112
Pre Funded Warrants [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Gross proceeds from sale of shares								$ 78	$ 4					$ 87
Number of shares issued and sold \| shares								783,707
Number of warrants exercised \| shares									370,000	8,277,112
Pre Funded Warrants [Member] \| Underwriter Warrants [Member]
Temporary Equity [Line Items]
Proceeds from sale of common stock														14,653
Maximum [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Gross proceeds from sale of shares														5,000
Minimum [Member] \| Underwriting Agreement [Member]
Temporary Equity [Line Items]
Gross proceeds from sale of shares														$ 5,000
BTIG LLC [Member]
Temporary Equity [Line Items]
Fixed commission rate entitled to placement agent														3.00%
At the Market Offering [Member] \| BTIG LLC [Member]
Temporary Equity [Line Items]
Sale of stock, number of shares sold in transaction \| shares														123,266
Proceeds from sale of common stock														$ 1,847
Fixed commission rate entitled to placement agent														3.00%
Average selling price of common stock \| $ / shares									$ 15.40					$ 15.40
Gross proceeds from sale of shares														$ 1,904
At the Market Offering [Member] \| BTIG LLC [Member] \| Maximum [Member]
Temporary Equity [Line Items]
Aggregate offering on sale of common stock									$ 11,000					11,000
Over-Allotment Option [Member] \| Common Units [Member]
Temporary Equity [Line Items]
Number of shares issued and sold \| shares	1,599,999				115,000
Confidential Marketed Public Offering [Member]
Temporary Equity [Line Items]
Sale of stock, number of shares sold in transaction \| shares				532,353			156,118
Average selling price of common stock \| $ / shares			$ 1.70	$ 1.70
Class of Warrant or Right Issued \| shares			34,605				10,151
Proceeds from Issuance of Common Stock and Warrants														$ 1,170
Confidential Marketed Public Offering [Member] \| Estimate of Fair Value Measurement [Member]
Temporary Equity [Line Items]
Class of warrant or right fair value per warrant			1.1946%	1.1946%			0.9332%
IPO [Member] \| Underwriter Warrants [Member]
Temporary Equity [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares									$ 1.6875					$ 1.6875