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Equity Compensation Plan - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 23, 2018 | Nov. 20, 2017 | Nov. 20, 2016 | Nov. 20, 2015 | Nov. 20, 2014 | Nov. 22, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2007
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, total |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value |  |  |  |  |  |  | 0 | 220,907 | 210,525 |
Employee service share-based compensation, non-vested awards, compensation cost not yet recognized |  |  |  |  |  |  | $ 611,644 |  |  |
Employee service share-based compensation, non-vested awards, compensation cost not yet recognized period for recognition |  |  |  |  |  |  | 7 months 20 days |  |  |
Non Vested Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period | 264,621 |  |  |  | 230,713 | 74,761 | 264,621 |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value | $ 3.59 |  |  |  | $ 7.58 | $ 7.26 | $ 3.59 |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 1 year |  |  |  | 3 years |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period |  | 57,678 | 57,678 | 115,357 |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value | $ 3.59 |  |  |  | $ 7.58 | $ 7.26 | $ 3.59 |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 1 year |  |  |  | 3 years |  |  |  |  |
Restricted Stock [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense, total |  |  |  |  |  |  | $ 338,356 | $ 129,245 | $ 340,377 |
The Plan Member |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, reserved percentage |  |  |  |  |  |  |  |  |  | 10.00%
The Plan Member | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period |  |  |  |  |  |  |  |  | 264,621 |
2007 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period |  |  |  |  |  |  |  |  | 555,479 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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