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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |
Valuation allowance increase (decrease) | $ 3.6 | $ 3.4
ASU 2016-09 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation allowance increase (decrease) | 0.9 |
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Pre-tax net operating loss carryforwards | 65.6 |
Federal research and development tax credits | $ 10.4 |
Federal [Member] | Minimum [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Expiration date of pre-tax net operating loss carryforwards | Jan. 01, 2029 |
Expiration date of federal research and development tax credits | Jan. 01, 2023 |
Federal [Member] | Maximum [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Expiration date of pre-tax net operating loss carryforwards | Jan. 01, 2036 |
Expiration date of federal research and development tax credits | Jan. 01, 2036 |

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