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Composition of Certain Balance Sheet Accounts - Schedule of Other Non-Current Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Other Assets, Noncurrent [Abstract]    
Contract Assets $ 21,502  
Deferred STC costs 8,411  
Deferred cost of equipment revenue   $ 40,986
Restricted cash 6,635 6,873
Other 19,579 19,248
Total other non-currentassets $ 56,127 $ 67,107