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Stockholders' Equity - Stock Option Activity (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Options, Number of Options [Roll Forward] |  |  |  |  |  |
Outstanding, beginning of period (in shares) |  | 0 |  | 0 | 0 |
Granted (in shares) |  | 0 | [1] |  | 0 |
Forfeited (in shares) |  | 0 |  | 0 | 0 |
Outstanding, end of period (in shares) |  | 0 |  | 0 | 0 | 0
Exercisable (in shares) |  | 0 |  |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |  |  |  |
Granted (in dollars per share) | [1] | $ 0 |  |  | $ 0 |
Forfeited (in dollars per share) | [1] | 0 |  |  |  |
Stock Options, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | [1] | 0 |  | $ 0 | 0 |
Granted (in dollars per share) | [1] | 0 |  |  | 0 |
Forfeited (in dollars per share) | [1] | 0 |  | 0 | 0 |
Outstanding, end of period (in dollars per share) | [1] | 0 |  | $ 0 | $ 0 | $ 0
Exercisable (in dollars per share) | [1] | $ 0 |  |  |  |
Stock Options, Weighted Average Remaining Life Years [Abstract] |  |  |  |  |  |
Outstanding | [1] | 0 years |  | 0 years | 0 years | 0 years
Exercisable | [1] | 0 years |  |  |  |
Minimum [Member] |  |  |  |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | [1] | $ 0 |  | $ 0 | $ 0 |
Forfeited (in dollars per share) | [1] |  |  | 0 | 0 |
Outstanding, end of period (in dollars per share) | [1] | 0 |  | 0 | 0 | $ 0
Exercisable (in dollars per share) | [1] | 0 |  |  |  |
Maximum [Member] |  |  |  |  |  |
Stock Options, Exercise Price per Share [Roll Forward] |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | [1] | 0 |  | 0 | 0 |
Forfeited (in dollars per share) | [1] |  |  | 0 | 0 |
Outstanding, end of period (in dollars per share) | [1] | 0 |  | $ 0 | $ 0 | $ 0
Exercisable (in dollars per share) | [1] | $ 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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