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Accounts Receivable, Net - Schedule of Changes in Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Receivable Net [Abstract]      
Allowance, at beginning of period $ (863) $ (374)  
Charged to bad debt expense (58) (558) $ (400)
Write-offs, net of recoveries 210 69  
Allowance, at end of period $ (711) $ (863) $ (374)