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Commitments and Contingencies (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2016 remainder of year   $ 1,239  
2017   789  
2018   364  
2019-2022   1,253  
Total   3,645  
Rent expense   400  
Deferred rent   $ 400 $ 400
Burlington facility      
Operating leases      
Period of hold over beyond lease termination date 30 days