Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at beginning of year	$ 250	$ 5,766
Gain on reduction of contingent obligation	3,409	3,000
Payment of contingent obligation	(250)	(2,516)
Balance at end of year	$ 0	$ 250