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Other Comprehensive Income (Loss) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax.    
Balance, beginning of period $ 78,581,000  
Balance, end of period 67,300,000  
Reclassifications out of accumulated other comprehensive income or loss, net of tax 0 $ 0
Tax effect 0 $ 0
Net unrealized loss on marketable securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax.    
Balance, beginning of period 2,000  
Net unrealized loss on marketable securities (51,000)  
Balance, end of period $ (49,000)