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v3.19.1

Summary of Outstanding Warrants Issued by Company (Detail) - $ / shares | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Feb. 08, 2017 | Aug. 13, 2014
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares Issuable Upon Exercise | 705,000 |  |
2014 Consultant Warrant |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares Issuable Upon Exercise | 85,000 |  |
Weighted Average Exercise Price | $ 10.70 |  | $ 10.70
Issue Date | Aug. 13, 2014 |  |
Expiration Date | Aug. 13, 2019 |  |
East West Bank Warrant |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares Issuable Upon Exercise | 40,000 |  |
Weighted Average Exercise Price | $ 3.64 | $ 3.64 |
Issue Date | Feb. 08, 2017 |  |
Expiration Date | Feb. 08, 2022 |  |
VLL7 and VLL8 Warrants |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of Shares Issuable Upon Exercise | 580,000 |  |
Weighted Average Exercise Price | $ 2.00 |  |
Issue Date | Feb. 08, 2017 |  |
Expiration Date | Feb. 08, 2022 |  |

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- 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=99377789&loc=d3e19207-110258 + Details
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