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Revenue - Components of Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Trade receivables $ 4,592 $ 6,425
Unbilled receivables 1,763 1,857
Other short-term receivables 19 7
Allowance for doubtful accounts (716) (1,816)
Total accounts receivable $ 5,658 $ 6,473