Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Issuance of Common Stock in Connection with Acquisition of CYS Investments, Inc. (Details)

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Stockholders' Equity Issuance of Common Stock in Connection with Acquisition of CYS Investments, Inc. (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 22, 2019
Jul. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Class of Stock [Line Items]        
Aggregate cash consideration exchanged for shares of CYS common stock   $ 15.0    
Common Stock [Member]        
Class of Stock [Line Items]        
Number of shares of stock issued during period (in shares) 18,000,000 72,600,000 24,390,456 12,468