Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Compensation expense (Details)

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Stock-Based Compensation - Compensation expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock Based Compensation      
Stock-based compensation $ 10,511 $ 5,707 $ 5,292
Operating expense      
Stock Based Compensation      
Stock-based compensation 113 108 178
Selling, general and administrative      
Stock Based Compensation      
Stock-based compensation $ 10,398 $ 5,599 $ 5,114