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Stockholders' Equity - Common Stock Warrants (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Warrant or Right [Line Items] |  |  |
Number of shares underlying outstanding warrants |  | 553,868 | 553,868
Exercise price per share |  | $ 0.33 | $ 0.33
Number of warrants exercised | 546,709 | 0 | 23,275
Warrants Exercised Weighted Average Exercise Price |  | $ 0.33 |
Proceeds from cash exercise of warrants | $ 2,336 |  |
Number of warrants expired | 0 |  | 1,544
Common Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Shares issued upon net exercise of outstanding warrants | 536,564 |  |
Shares issued upon cash exercise of warrants | 7,159 |  |

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- Definition Number Of Warrants Exercised + References No definition available. + Details
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- Definition Warrants Exercised Weighted Average Exercise Price + References No definition available. + Details
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- 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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- 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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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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