Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Legal Proceedings (Details)

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Commitments and Contingencies - Legal Proceedings (Details) - item
1 Months Ended 2 Months Ended
Aug. 02, 2019
May 29, 2019
Feb. 28, 2019
Jan. 31, 2019
Nov. 30, 2018
Class Actions In Eastern District Of Pennsylvania [Member]          
Loss Contingencies [Line Items]          
Number of claims       3 3
Number of claims after consolidation       1  
Number of investors appointed   5      
Number of former officers 2        
Shareholder Derivative Actions [Member]          
Loss Contingencies [Line Items]          
Number of claims     2