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Revenue - Components of Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Revenue from Contract with Customer [Abstract] |  |
Trade receivable | $ 11,403 | $ 14,261
Unbilled receivable | 2,338 | 5,540
Insurance proceeds receivable (Note 14) | 1,978 | 0
Other short-term receivable | 124 | 9
Allowance for doubtful accounts | (1,216) | (1,411)
Total accounts receivable | $ 14,627 | $ 18,399

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