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Termination Costs - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Severance costs | $ 819,000 |  | $ (356,000) | $ 3,000,000 | $ (356,000)
Stock-based compensation | 0 | $ 25,000 | $ 0 | $ 25,000 | $ 0
Workforce Reduction |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Severance costs |  | $ 2,200,000 |  |  |
Pennsylvania | Non-Core Assets |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Severance costs | $ 819,000 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees as it relates to exit or disposal activities pursuant to an authorized plan. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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