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Revenue Recognition - Schedule of Contract Liabilities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Revenue Recognition [Abstract]  
Balance at January 1, 2019 $ 1,297
New performance obligations 1,156
Revenue recognized (1,697)
Balance at September 30, 2019 756
Less non-current portion (13)
Current portion at September 30, 2019 $ 743