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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |
Statutory income tax (benefit) expense | 21.00% | 21.00% | (34.00%)
Net change in valuation allowance | $ (13,490) | $ (3,689) | $ (21,851)
Tax Cuts and Jobs Act of 2017, Percentage of Deferred Tax Asset Which Can be Used for Offset | 80.00% |  |
Net operating loss carryforwards for U.S. federal income tax purposes | $ 131,621 |  |
Research and experimentation credit carryforwards | 4,250 |  |
Unrecognized tax benefits that would impact effective tax rate | 561 | 545 |
Unrecognized tax benefits that reduce deferred tax assets | 462 | 384 |
Interest and penalty expense recognized | 0 | 0 | $ 13
Total accrued interest and penalties | $ 4 | $ 9 |
Minimum [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Foreign statutory tax rate, foreign operations | 25.00% |  |

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