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Fair Value Measurements - Summary of the Carrying Value and Fair Value of Convertible Subordinated Notes (Details) - Fair Value Inputs Level 3
$ in Thousands
Sep. 27, 2019
USD ($)
Carrying Value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Convertible Unsecured Note $ 4,000
Fair Value  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Convertible Unsecured Note $ 4,273