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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |  |
Unrecognized tax benefits at the beginning of year | $ 14,620,000 | $ 14,553,000 | $ 2,223,000
Gross increases - current year tax positions |  |  | 13,899,000
Gross increases - prior year tax positions | 360,000 | 67,000 |
Gross decreases - prior year tax positions |  |  | (1,569,000)
Unrecognized tax benefits at end of year | 14,980,000 | 14,620,000 | $ 14,553,000
Interest and penalties in year-end balance | 427,000 | 67,000 |
Interest expense related to uncertain tax positions | $ 360,000 | $ 67,000 |

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