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Stockholders' Equity - RSU activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Weighted-average grant date fair value (per share)            
Stock-based compensation $ 100     $ 200 $ 1,100 $ 500
Non-cash compensation expense not yet charged to net income         $ 2,500 $ 1,400
RSUs and RSAs            
Number of shares            
Outstanding, Beginning balance 173,735 177,891 118,904   118,904  
Granted (in shares)   21,356 111,097      
Vested (in shares) (6,336) (19,766) (52,110)      
Forfeited (in shares)   (5,746)        
Outstanding, Ending balance 167,399 173,735 177,891   167,399  
Grant date fair value            
Beginning balance $ 2,647 $ 2,712 $ 1,661   $ 1,661  
Granted   310 1,784      
Vested (100) (293) (733)      
Forfeited   (82)        
Ending balance $ 2,547 $ 2,647 $ 2,712   $ 2,547  
Weighted-average grant date fair value (per share)            
Beginning balance $ 15.24 $ 15.25 $ 13.97   $ 13.97  
Granted (in per share)   14.51 16.06      
Vested (in per share) 15.79 14.84 14.07      
Forfeited (in per share)   14.21        
Ending balance $ 15.21 $ 15.24 $ 15.25   $ 15.21  
RSU            
Number of shares            
Fully vested units not yet issued as common stock         23,104