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Income Tax - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Deferred tax assets: |  |  |  |
Depreciation of property and equipment, net | $ 69 |  |  |
Government grants | 372 |  |  |
Deferred revenue | 1,907 |  |  |
Net operating loss forwards | 102,579 |  |  |
Less: valuation allowance | $ (104,927) | $ (63,215) | $ (66,399) | $ (49,928)

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