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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Operating lease right-of-use assets $ 14,589 $ 13,600  
Current portion of long-term lease obligations 7,492 6,200  
Long-term lease obligations $ 7,191 $ 7,400  
Weighted average remaining lease terms 2 years 7 months 6 days    
Operating lease weighted average discount rate 6.30%    
Other current assets      
Property, Plant and Equipment [Line Items]      
Restricted cash, current $ 4,200   $ 3,900
Minimum      
Property, Plant and Equipment [Line Items]      
Warranty, term 1 year    
Maximum      
Property, Plant and Equipment [Line Items]      
Warranty, term 2 years