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Debt - Expected Future Principal and Interest Payments Based on Debt Balances (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2019, Principal $ 7,857
2020, Principal 8,571
2021, Principal 8,572
2022, Principal 5,000
Total, Principal 30,000
2018, Interest 2,554
2019, Interest 2,280
2020, Interest 1,558
2021, Interest 822
2022, Interest 2,542
Total, Interest 9,756
2018, Total 2,554
2019, Total 10,137
2020, Total 10,129
2021, Total 9,394
2022, Total 7,542
Total $ 39,756