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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Dec. 04, 2015
lawsuit
Nov. 24, 2015
shareholder
Nov. 19, 2015
lawsuit
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Operating Leases          
Rent expense | $       $ 127 $ 123
Contingencies          
Contingent liabilities | $       $ 0  
Class Action Lawsuits          
Contingencies          
Number of stockholders filed motions to appoint lead plaintiff | shareholder   3      
Number of lawsuits filed | lawsuit     3    
Number of lawsuits dismissed | lawsuit 3