Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details)

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Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stock-based compensation expense by type of award:        
Stock-based compensation expense $ 1,277 $ 1,779 $ 4,061 $ 5,365
Stock Option Plan Awards        
Stock-based compensation expense by type of award:        
Stock-based compensation expense 184 776 709 1,923
Restricted stock units and restricted stock awards        
Stock-based compensation expense by type of award:        
Stock-based compensation expense 892 791 2,975 3,048
Employee Stock Purchase Plan        
Stock-based compensation expense by type of award:        
Stock-based compensation expense $ 201 $ 212 $ 377 $ 394