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The Company and Summary of Significant Accounting Policies - Summary of outstanding warrants to purchase common stock (Detail) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Pre Funded Common Stock Warrants [Member]
Class of Warrant or Right [Line Items]
Number of shares	2,310,776	2,310,776
Exercise price	$ 0.001	$ 0.001
Common Stock Warrants One [Member]
Class of Warrant or Right [Line Items]
Number of shares	662,500	662,500
Exercise price	$ 2.35	$ 2.35
Expiration date	Jan. 30, 2023	Jan. 30, 2023
Common Stock Warrants Two [Member]
Class of Warrant or Right [Line Items]
Number of shares	36,910,809	36,910,809
Exercise price	$ 0.30	$ 0.30
Expiration date	Oct. 30, 2023	Oct. 30, 2023

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ 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

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Number of warrants or rights outstanding.

+ 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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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X

- Definition

Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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