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Revenue Recognition - Schedule of Contract Liabilities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Revenue Recognition [Abstract]  
Balance at January 1, 2019 $ 1,297
New performance obligations 519
Revenue recognized (1,281)
Balance at June 30, 2019 535
Less non-current portion (17)
Current portion at June 30, 2019 $ 518