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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 19, 2012
Income Taxes [Line Items] |  |  |  |  |  |  |
Net (loss) income attributable to common and participating stockholders | $ (1,996,000) | $ (25,824,000) | $ (7,779,000) | $ (12,535,000) |  |  |
Percentage of net operating loss carry forwards | 100.00% |  | 100.00% |  |  |  |
Valuation allowance recorded to be reduce to | 0.00% |  | 0.00% |  |  |  |
Income tax expense or benefit |  |  | $ 0 |  |  | $ 0 |
Income tax at the federal statutory rate |  |  | 21.00% |  |  | 35.00% |
Income tax paid |  |  | $ 0 |  |  | $ 0 |
Reduction of deferred tax asset relating to NOL carry-forward |  |  | $ 842,900,000 |  |  |  |
Valuation allowance equal to net deferred federal income tax asset | 100.00% |  | 100.00% |  |  | 100.00% |
Abandoned stock |  |  |  |  |  |  | $ 8,400,000,000
Available and utilizable NOL carry forward |  |  |  |  |  | $ 6,000,000,000 |
NOLs expiration date |  |  | 2031 |  |  |  |
Capital loss carryforward subject to expiration year |  |  | 2018 |  |  | 2018 |
Reserves for uncertain federal income tax positions | $ 0 |  | $ 0 |  |  |  |
Income tax interest income, expense or penalties |  |  | $ 0 |  |  | $ 0 |
Income tax examination, year under examination |  |  | 2011 |  |  |  |
Capital Loss Subject to Expiration in 2018 |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Capital loss carryforward | $ 1,600,000 |  | $ 1,600,000 |  |  | $ 1,600,000 |
Scenario Plan [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Income tax at the federal statutory rate |  |  |  |  | 21.00% |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: 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.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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