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Stock and Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock issued in connection with ESPP |  |  | 7,151 | 8,142 |
Additional compensation cost that will be recognized in future periods |  |  | $ 560 |  |
Director |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock units reserved for issuance in lieu of retainer fee |  |  | 72,000 | 73,750 |
Minimum | Director |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of retainer fee to acquire common stock |  |  | 50.00% |  |
Maximum | Director |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of retainer fee to acquire common stock |  |  | 100.00% |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Conversion of stock RSU to Common, ratio |  |  | 100.00% |  |
Convert to common stock |  |  | 25.00% |  |
Increment period for awards converted into common stock |  |  | 4 years |  |
Stock compensation expense |  |  | $ 300 | $ 490 |
Weighted average period additional compensation cost will be expensed |  |  | 3 years |  |
Vesting percentage |  |  |  | 75.00% |
Granted restricted stock unit |  | 605,000 | 56,759 | 31,327 |
Restricted Stock Units (RSUs) | Award Subject to 2018 Performance Measures |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Granted restricted stock unit |  | 541,000 |  |  |
Restricted Stock Units (RSUs) | Two Thousand Seven Employee Stock Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance under the plan |  |  |  |  | 1,700,000
Board of Directors Deferred Compensation | Director | General and Administrative Expense |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense |  |  | $ 80 | $ 70 |
Common Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issued during period |  |  | 351,024 | 113,579 |
Common stock issued as payment of accrued preferred dividends |  |  | 246,803 |  |
Common stock issued upon the vesting of restricted stock units | [1] |  | 97,070 | 105,437 |
Common stock issued in connection with ESPP |  |  | 7,151 | 8,142 |
[1] | Converted to common stock.

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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