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Warrants - Summary of the Warrants Outstanding (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2019	Feb. 12, 2019	Feb. 04, 2019	Jan. 31, 2019	Sep. 30, 2018
Class of Warrant or Right [Line Items]
Warrants, Exercise Price	$ 7.50	$ 1.8313	$ 2.125	$ 2.125
Warrants Outstanding	18,953,195				5,258,444
Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 83.50
Warrants, Expiration Date	Mar. 21, 2019
Warrants Outstanding					3,926
Underwriter [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.8313
Warrants, Expiration Date	Feb. 07, 2024
Warrants Outstanding	110,922
Investor [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.34	$ 1.34
Warrants, Expiration Date	Aug. 12, 2024
Warrants Outstanding	1,706,484
Underwriter One [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 2.125
Warrants, Expiration Date	Jan. 30, 2024
Warrants Outstanding	34,605
Underwriter Two [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 2.125
Warrants, Expiration Date	Jan. 26, 2024
Warrants Outstanding	10,151
Underwriter Three [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.6875
Warrants, Expiration Date	Apr. 03, 2024
Warrants Outstanding	797,334
Warrants Issued [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 3.90
Warrants, Expiration Date	Jun. 03, 2024
Warrants Outstanding	937,500
Public Offering One [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 7.50
Warrants, Expiration Date	Apr. 03, 2023
Warrants Outstanding	2,350,011				4,815,000
Public Offering Two [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 7.50
Warrants, Expiration Date	Apr. 04, 2023
Warrants Outstanding	115,000				230,000
Private Placement Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 75.50
Warrants, Expiration Date	May 06, 2024
Warrants Outstanding	319,008				319,008
Hercules Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 83.50
Warrants, Expiration Date	Jun. 16, 2020
Warrants Outstanding	2,515				2,515
MTS Warrants [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 118.00
Warrants, Expiration Date	Aug. 31, 2020
Warrants Outstanding	3,000				3,000
Public Offering Three [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 0.01
Warrants Outstanding	300,000
Public Offering Four [Member]
Class of Warrant or Right [Line Items]
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.35
Warrants, Expiration Date	Apr. 08, 2024
Warrants Outstanding	12,266,665
Adjustment for Reverse Stock Split [Member]
Class of Warrant or Right [Line Items]
Warrants Outstanding					(5)

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Section S99
-Paragraph 1
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