Commitments and Contingencies - Lease Obligations (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017	$ 1,440
2018	1,278
2019	646
2020	653
2021	596
Thereafter	504
Total minimum lease payments	5,117
2017	36
2018	36
2019	36
2020	33
2021	0
Thereafter	0
Total minimum lease payments	141
Less: Amount representing interest	(11)
Capital lease obligation	$ 130