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Stockholders' Equity - Common Stock Warrants (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Warrant or Right [Line Items] |  |  |
Number Of Warrants Exercised | 0 | 23,275 | 11,908
Warrants Exercised Weighted Average Exercise Price |  | $ 0.33 | $ 0.33
Number of warrants expired | 0 | 1,544 | 0
Warrants expiring July 18, 2018 | Common Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares underlying outstanding warrants | 236,632 |  |
Exercise price per share | $ 0.33 |  |
Warrants expiring January 16, 2019 | Common Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares underlying outstanding warrants | 301,986 |  |
Exercise price per share | $ 0.33 |  |
Warrants expiring January 30, 2019 | Common Stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares underlying outstanding warrants | 15,250 |  |
Exercise price per share | $ 0.33 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 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://www.xbrl.org/2003/role/presentationRef -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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