Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Class A Voting Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	24,645,825	24,506,647
Common stock, shares outstanding (in shares)	24,645,825	24,506,647
Class B Non-Voting Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	5,000	5,000
Common stock, shares issued (in shares)	0	2,500
Common stock, shares outstanding (in shares)	0	2,500
Series A-1 Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)	91,784	83,968
Preferred stock, shares outstanding (in shares)	91,784	83,968
Series B Convertible Participating Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0

Face amount or stated value per share of common stock.

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