Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward | |||
| Beginning Balance | $ 8,625 | $ 9,666 | $ 5,503 |
| Increase related to current year tax position | 581 | 592 | 2,687 |
| (Decrease) increase related to prior year tax position | (3,705) | (1,633) | 1,476 |
| Ending Balance | $ 5,501 | $ 8,625 | $ 9,666 |
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Unrecognized tax benefits increase (decrease) resulting from prior period tax positions. No definition available.
|