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Revenue Recognition - Schedule of Contract Liabilities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Revenue Recognition [Abstract]  
Balance at January 1, 2019 $ 1,401
New performance obligations 260
Revenue recognized (444)
Balance at March 31, 2019 1,217
Less non-current portion (23)
Current portion at March 31, 2019 $ 1,194