Debt - Principal and Interest Payments on Debt (Detail) $ in Thousands	Dec. 31, 2015 USD ($)	[1]
Debt Instrument [Line Items]
2016, Principal	$ 3,050
2017, Principal	6,428
2018, Principal	6,892
2019, Principal	3,630
Total, Principal	20,000
2016, Interest	1,352
2017, Interest	980
2018, Interest	517
2019, Interest	1,474
Total, Interest	4,323
2016, Total	4,402
2017, Total	7,408
2018, Total	7,409
2019, Total	5,104
Total	$ 24,323

[1] Unless interest only period extends to December 31, 2016, as described below.