Fair Value Measurements (Tables)  | 
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| Fair Value Disclosures [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value of Assets and Liabilities | 
 
The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018 and the level they fall within the fair value hierarchy (in thousands):
 
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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