Overview and Significant Accounting Policies (Details) $ / shares in Units, $ in Millions			9 Months Ended
	Jan. 31, 2018 shares	Jan. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2019 segments shares	Dec. 31, 2018 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | segments			1
Subsidiary, Sale of Stock [Line Items]
Dividend rate (as percent)			5.00%
Conversion ratio	0.1
Common stock, shares authorized (in shares)	25,000,000	250,000,000	25,000,000	25,000,000
Preferred stock, preferred stock authorized (in shares)	1,000,000		1,000,000.0	1,000,000
Securities Purchase Agreement | Series A Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)		9,926
Consideration received on transaction | $		$ 9.9
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		$ 1.0
Consideration received on transaction | $		$ 9.9
Dividend rate (as percent)		5.00%
Shares issuable upon conversion (in shares)		1,001,614.000
Shares issuable upon conversion (as percent)		16.00%