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Overview and significant Accounting Policies (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2019
segments
Jan. 31, 2018
Subsidiary, Sale of Stock [Line Items]      
Number of reportable segments | segments   1  
Securities Purchase Agreement | Series A Preferred Stock      
Subsidiary, Sale of Stock [Line Items]      
Number of shares issued (in shares) 9,926    
Dividend rate (as percent)   5.00%  
Securities Purchase Agreement | Wipro | Series A Preferred Stock      
Subsidiary, Sale of Stock [Line Items]      
Number of shares issued (in shares) 9,926.000    
Convertible preferred stock, Series A convertible par value (in dollars per share) | $ / shares $ 1.00    
Consideration received on transaction | $ $ 9.9    
Dividend rate (as percent) 5.00%    
Shares issuable upon conversion (in shares) 1,001,614    
Shares issuable upon conversion (as percent) 16.00%   16.00%