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Overview and Basis of Presentation - Additional Information (Detail)
Jul. 29, 2019
Jun. 30, 2019
Subsequent Event    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Reverse stock split one-for-eight  
Reverse stock split, ratio 0.125  
M&I Electric Industries, Inc.    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Ownership interest in wholly-owned subsidiary   100.00%