Debt - Principal and Interest Payments on Debt (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Debt Disclosure [Abstract]
2017, Principal	$ 7,013
2018, Principal	8,178
2019, Principal	4,308
Total, Principal	19,499
2017, Interest	1,160
2018, Interest	613
2019, Interest	1,488
Total, Interest	3,261
2017, Total	8,173
2018, Total	8,791
2019, Total	5,796
Total	$ 22,760