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Stockholders Equity - RSU activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Weighted-average grant date fair value (per share)          
Stock-based compensation $ 1,500   $ 600 $ 2,900 $ 1,000
Non-cash compensation expense not yet charged to net income       $ 17,900 $ 2,600
RSUs and RSAs          
Number of shares          
Outstanding, Beginning balance 1,157,761 1,009,617   1,009,617  
Granted (in shares)   208,514      
Vested (in shares) (16,452) (60,370)      
Outstanding, Ending balance 1,141,309 1,157,761   1,141,309  
Grant date fair value          
Beginning balance $ 18,126 $ 15,722   $ 15,722  
Granted   3,298      
Vested (227) (894)      
Ending balance $ 17,900 $ 18,126   $ 17,900  
Weighted-average grant date fair value (per share)          
Beginning balance $ 15.66 $ 15.57   $ 15.57  
Granted (in per share)   15.82      
Vested (in per share) 13.78 14.81      
Ending balance $ 15.68 $ 15.66   $ 15.68