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Summary of Principal Contractual Obligations, Excluding Operating Leases (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Purchase Commitments  
2019 (remaining six months) $ 12,251
2020 1,295
Total 13,546
Other Contractual Commitments  
2019 (remaining six months) 108
Total 108
Total Commitments  
2019 (remaining six months) 12,359
2020 1,295
Total $ 13,654