Stock-Based Compensation Plans - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2018 |
Mar. 31, 2017 |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Share-based compensation expense - Independent contractors | $ 1,510 | $ 817 |
Allocated share-based compensation expense | 2,613 | 1,866 |
Employee Stock Purchase Plan [Member] | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Allocated share-based compensation expense | 39 | 46 |
Restricted Stock Awards [Member] | Non-Employee Directors [Member] | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Allocated share-based compensation expense | 111 | 89 |
Restricted Stock Units [Member] | Employees [Member] | ||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Allocated share-based compensation expense | $ 953 | $ 914 |
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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