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Debt - Principal and Interest Payments on Debt (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
 [1]
Debt Instrument [Line Items]  
2015, Principal $ 0
2016, Principal 3,050
2017, Principal 6,428
2018, Principal 6,892
2019, Principal 3,630
Total, Principal 20,000
2015, Interest 349
2016, Interest 1,352
2017, Interest 980
2018, Interest 517
2019, Interest 1,474
Total, Interest 4,672
2015, Total 349
2016, Total 4,402
2017, Total 7,408
2018, Total 7,409
2019, Total 5,104
Total $ 24,672
[1] Unless interest only period extends to December 31, 2016, as described below.