Exercise price per share or per unit of warrants or rights outstanding.

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Face amount or stated value per share of common stock.

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Related Party Transactions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Dec. 06, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Oct. 25, 2018
Related Party Transaction [Line Items]
Common stock, par value		$ 0.001		$ 0.001
Wilson Sonsini Goodrich And Rosati (WSGR) [Member]
Related Party Transaction [Line Items]
Related party expenses		$ 0.2	$ 0.3
Common Stock \| Rights Offering [Member]
Related Party Transaction [Line Items]
Right entitlement to holder	3,581,148				0.19860755
Exercise price of warrants/rights					$ 12.57
Net proceeds	$ 44.8
Common Stock \| Chairman, Robert W. Duggan [Member] \| Rights Offering [Member]
Related Party Transaction [Line Items]
Ownership percentage	35.00%