Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Preferred Stock (In USD Per Share)	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized (In Shares)	50,000,000	50,000,000
Preferred Stock, Shares Issued (In Shares)	0	0
Preferred Stock, Shares Outstanding (In Shares)	0	0
Common Stock ( In USD Per Share)	$ 0.001
Common Class C
Common Stock ( In USD Per Share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized (In Shares)	300,000,000	200,000,000
Common Stock, Shares, Issued (In Shares)	12,943,294	8,838,002
Common Stock, Shares, Outstanding (In Shares)	12,943,294	8,838,002
Common Class S
Common Stock ( In USD Per Share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized (In Shares)	100,000,000	100,000,000
Common Stock, Shares, Issued (In Shares)	17,594	3,032
Common Stock, Shares, Outstanding (In Shares)	17,594	3,032

Face amount or stated value per share of common stock.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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