Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Income Taxes | |||
| Change in valuation allowance | $ 5,519 | $ (10,754) | $ 5,097 |
| Income tax (expense) benefit | $ 0 | $ 0 | $ 0 |
| X | ||||||||||
- References No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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