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Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Accounts receivable, allowance $ 49 $ 42
Stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 40,000,000 40,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common Stock, Voting [Member]    
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 190,000,000 190,000,000
Common stock, shares issued (in shares) 19,657,946 19,553,857
Common stock, shares outstanding (in shares) 19,657,946 19,553,857
Common Stock, Nonvoting [Member]    
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0