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Stock and Stock-based Compensation - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 29, 2016 shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | May. 31, 2014 shares | Dec. 31, 2013 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock issued to ESPP, shares |  | 5,668 | 3,640 |  |
Additional compensation cost that will be recognized in future periods | $ |  | $ 2,100,000 |  |  |
Stock options issued |  | 0 | 0 |  |
Stock options outstanding |  | 0 | 0 |  | 16,944
Unrecognized compensation cost related to stock option | $ |  | $ 0 |  |  |
Director |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock units reserved for issuance in lieu of retainer fee |  | 36,200 | 18,000 |  |
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 |  | 1 |  |  |
Convert to common stock |  | 25.00% |  |  |
Increment period for awards converted into common stock |  | 4 years |  |  |
Weighted average period additional compensation cost will be expensed |  | 3 years |  |  |
Granted restricted stock unit |  | 231,356 | 160,000 |  |
Restricted Stock Units (RSUs) | Subsequent Event |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Granted restricted stock unit | 343,000 |  |  |  |
Restricted Stock Units (RSUs) | Award Subject to 2016 Performance Measures | Subsequent Event |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Granted restricted stock unit | 275,000 |  |  |  |
Restricted Stock Units (RSUs) | General and Administrative Expense |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense | $ |  | $ 460,000 | $ 680,000 |  |
Stock Options |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense | $ |  | 0 | 0 |  |
Board of Directors Compensation | General and Administrative Expense | Director |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock compensation expense | $ |  | $ 178,000 | $ 130,000 |  |
Two Thousand Seven Employee Stock Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance under the plan |  |  |  | 1,700,000 |

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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=6415400&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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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