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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of the beginning and ending amount of unrecognized tax benefits      
Unrecognized tax benefits, beginning of period $ 1,871 $ 1,571 $ 727
Gross increases-tax position in prior period   0 548
Gross increases-current period tax position 351 300 296
Unrecognized tax benefits, end of period 2,222 $ 1,871 $ 1,571
Interest expense or penalties related to unrecognized tax benefits 0    
Federal      
Credit carryforwards      
Credit carryforwards available to reduce future taxable income 3,300    
State      
Credit carryforwards      
Credit carryforwards available to reduce future taxable income $ 2,700