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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Redeemable Convertible Preferred Stock Series B [Member]
Preferred stock, par or stated value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock liquidation preference value (in dollars per share)	$ 1,000	$ 1,000
Preferred stock shares authorized (in shares)	35,000	35,000
Preferred stock shares issued (in shares)	16,000	16,900	35,000
Preferred stock shares outstanding (in shares)	16,000	16,900
Common Class A [Member]
Common stock, par or stated value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock shares issued (in shares)	17,733,947	17,721,422
Common stock shares outstanding (in shares)	17,733,947	17,721,422

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Face amount or stated value per share of common stock.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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