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Liabilities - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued expenses and other current liabilities    
Payroll and related benefits $ 14,768 $ 20,486
Warranty 7,099 7,852
Operating lease liability 4,440  
Interest 4,321 4,321
Professional fees 2,219 2,897
Sales, use, and other taxes 1,547 2,670
Restructuring liability 1,336 2,213
Other 7,067 6,011
Total $ 42,797 $ 46,450