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Commitments and Contingencies - Legal Matters (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
May 31, 2017
Settled Litigation | Melcher Litigation    
Loss Contingencies [Line Items]    
Litigation settlement amount awarded to other party $ 1,700  
Indemnification Agreement    
Loss Contingencies [Line Items]    
Estimate of possible loss   $ 62