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Fair Value Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment $ 1,859  
Long Lived Assets Held-for-sale, Description 1  
Cash and cash equivalents | Level 1    
Cash and cash equivalents $ 31,083 $ 42,337
Cash and cash equivalents | Level 2    
Cash and cash equivalents 0 0
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 1,859  
Cash and cash equivalents | Level 3    
Cash and cash equivalents $ 0 $ 0