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Stock and Stock-based Compensation - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2011 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Additional compensation cost that will be recognized in future periods |  | $ 20,000 |  |
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 |  | $ 520,000 | $ 300,000 |
Weighted average period additional compensation cost will be expensed |  | 3 years |  |
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 |  |  |  | 2,200,000
Board of Directors Deferred Compensation | Director | General and Administrative Expense |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock compensation expense |  | $ 200,000 | $ 80,000 |
Common Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock issued in connection with ESPP |  | 7,614 | 7,151 |
Employee Stock Purchase Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of common stock allowed to sell to employees | 125,000 |  |  |
Percentage of shares transacted at fair market value | 95.00% |  |  |

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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 Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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