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Property and Equipment, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 42,666 $ 37,109  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (27,990) (23,102)  
Property, Plant and Equipment, Net 14,676 14,007  
Depreciation 5,478 5,358 $ 6,421
Disposal of Property Plant and Equipment 456 1,823 2,258
Gain (Loss) on Disposition of Assets 37 59 19
Full Depreciated Assets in Use 14,008 11,080  
Internal-use software development costs capitalized 4,613 2,797 $ 1,048
Internal Use Software Developed, Subject To Amortization 2,819 1,000  
Capitalized Computer Software, Amortization 1,054 100  
Tangible Asset Impairment Charges 0    
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 3,208 2,958  
Furniture and Fixtures [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Computer Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 19,644 18,950  
Computer Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Computer Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 5,432 5,430  
Software [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Software [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 6 years    
Software Development [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Property, Plant and Equipment, Gross $ 8,775 4,102  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives Shorter of lease term or useful life    
Property, Plant and Equipment, Gross $ 5,587 5,650  
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 20 19  
Cloud-based product offerings [Member]      
Property, Plant and Equipment [Line Items]      
Internal-use software development costs capitalized $ 4,673 $ 3,024