Capitalization - Class C Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended
	Jun. 26, 2017	Aug. 11, 2015	Mar. 31, 2015
Capitalization
Shares issued (in shares)	4,111,250
Share price (in dollars per share)	$ 70.00
Preferred Stock | Class C Preferred Stock
Capitalization
Shares issued (in shares)		504,478	551,472
Share price (in dollars per share)		$ 3.96	$ 4.53
Cash proceeds			$ 5.0