CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Common stock for redemption	5,217,077	5,234,134
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized	1,000,000	1,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common Class A [Member]
Common Stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, authorized	15,000,000	15,000,000
Common Stock, issued	776,673	759,616
Common Stock, outstanding	776,673	759,616
Common Class B [Member]
Common Stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, authorized	3,000,000	3,000,000
Common Stock, issued	1,437,500	1,437,500
Common Stock, outstanding	1,437,500	1,437,500

Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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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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