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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts receivable, allowance for doubtful accounts $ 0 $ 0
Common Class A [Member]    
Common stock, par value $ .0001 $ 0.0001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 13,390,270 12,935,546
Common stock, shares outstanding 13,390,270 12,935,546
Common Class B [Member]    
Common stock, par value $ .0001 $ 0.0001
Common stock, shares authorized 7,303,533 7,303,533
Common stock, shares issued 2,409,738 2,409,738
Common stock, shares outstanding 2,409,738 2,409,738