Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Assets and Liabilities - Summary of Long-term Debt Carried at Amortized Cost on Consolidated Balance Sheet (Details)

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Fair Value of Financial Assets and Liabilities - Summary of Long-term Debt Carried at Amortized Cost on Consolidated Balance Sheet (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Book Value  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Current portion of long-term debt $ 1,019
Long-term debt, less current portion 13,079
Total 14,098
Approximate Fair Value  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Current portion of long-term debt 1,019
Long-term debt, less current portion 13,035
Total 14,054
Level 2 | Approximate Fair Value  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Current portion of long-term debt 1,019
Long-term debt, less current portion 13,035
Total $ 14,054