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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Accumulated depreciation and amortization $ 4,179 $ 1,499
Preferred stock par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares outstanding (in shares) 0 0
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) 22,867,405 22,640,677
Common stock, shares outstanding (in shares) 18,554,626 18,576,489
Treasury stock (in shares) 4,312,779 4,064,188