Income Taxes - Summary of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Current:
State	$ 0	$ 3
Current income tax expense (benefit)	0	3
Deferred:
Federal	(73)	154
State	(6)	13
Deferred income tax expense (benefit)	(79)	167
Income tax (benefit) expense	$ (79)	$ 170