| Accrued Expenses | 9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2019 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Payables And Accruals [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued Expenses | 8. Accrued Expenses Accrued expenses consist of the following: 
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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- References No definition available. 
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