Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 129	$ 82	$ 93
State	131	27	30
Current tax expense	260	109	123
Deferred:
Federal	0	(3)	0
State	0	(1)	1
Deferred tax expense	0	(4)	1
Total tax expense	$ 260	$ 105	$ 124