Classification of Compensation Expense Associated with Share-Based Payments (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Allocated Share-based Compensation Expense | $ 2,207 | $ 3,065 | $ 3,350 |
| Cost Of Revenue | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Allocated Share-based Compensation Expense | 207 | 226 | 333 |
| Sales and Marketing | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Allocated Share-based Compensation Expense | 235 | 477 | 679 |
| General and Administrative | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Allocated Share-based Compensation Expense | 1,469 | 2,051 | 2,020 |
| Engineering And Development | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Allocated Share-based Compensation Expense | $ 296 | $ 311 | $ 318 |
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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 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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