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Income Taxes Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ (87,764) | $ 0 | $ (106,771) | $ (62,800) | $ 0 | $ 0 | $ 0 | $ 2,169,811 | $ (257,335) | $ 2,169,811 | $ 0
Tax benefits expired | 10,600,000 |  |  |  |  |  |  |  | 10,600,000 |  |
Unrecognized tax benefits that would impact effective tax rate | 9,900,000 |  |  |  | $ 8,300,000 |  |  |  | 9,900,000 | $ 8,300,000 | $ 7,100,000
Federal |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards that will expire due to IRC Section 382 limitations | 483,300,000 |  |  |  |  |  |  |  | 483,300,000 |  |
Net operating loss carryforwards | 186,600,000 |  |  |  |  |  |  |  | 186,600,000 |  |
State |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 149,100,000 |  |  |  |  |  |  |  | 149,100,000 |  |
California |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards that will expire due to IRC Section 382 limitations | 68,600,000 |  |  |  |  |  |  |  | 68,600,000 |  |
Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards that will expire due to IRC Section 382 limitations | 80,500,000 |  |  |  |  |  |  |  | 80,500,000 |  |
Research Tax Credit Carryforward | Federal |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward amount | 17,300,000 |  |  |  |  |  |  |  | 17,300,000 |  |
Research Tax Credit Carryforward | State |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward amount | $ 3,200,000 |  |  |  |  |  |  |  | $ 3,200,000 |  |

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