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Stockholders' Equity - Summary of Non-vested Options (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Non-vested Options, Number of Options [Roll Forward] |  |  |  |  |
Non-vested, beginning of period (in shares) | [1] | 0 |  | 0 |
Granted (in shares) |  | 0 | [1] |  | 0
Vested (in shares) | [1] | 0 |  | 0 |
Forfeited (in shares) | [1] | 0 |  | 0 |
Non-vested, end of period (in shares) | [1] | 0 |  | 0 | 0
Non-vested Options, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |
Non-vested, beginning of period (in dollars per share) | [1] | $ 0 |  | $ 0 |
Granted (in dollars per share) | [1] | 0 |  |  |
Vested (in dollars per share) | [1] | 0 |  | 0 |
Forfeited (in dollars per share) | [1] | 0 |  | 0 |
Non-vested, end of period (in dollars per share) | [1] | $ 0 |  | $ 0 | $ 0
[1] | Due to the May 2, 2018 1-for-500 reverse stock split, and no fractional shares being issued, all numbers are reduced to zero.

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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