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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount $ 3,030 $ 3,030
Accumulated Amortization (1,957) (1,491)
Total Net Carrying Amount 1,073 1,539
Developed technology    
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount 2,460 2,460
Accumulated Amortization (1,478) (1,126)
Total Net Carrying Amount 982 1,334
Customer relationships    
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount 520 520
Accumulated Amortization (437) (333)
Total Net Carrying Amount 83 187
Domain names    
Acquired Finite-Lived Intangible Assets    
Gross Carrying Amount 50 50
Accumulated Amortization (42) (32)
Total Net Carrying Amount $ 8 $ 18