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Summary of Significant Accounting Policies - Summary of Changes in Contract Liabilities (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Contract liabilities:  
Deferred revenue, Balance at Beginning of Period $ 59,868
Deferred revenue, Additions 19,000
Deferred revenue, Deductions (22,936)
Deferred revenue, Balance at End of Period $ 55,932