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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock-based compensation expense by type of award:        
Stock-based compensation expense $ 1,565 $ 3,216 $ 6,930 $ 9,783
Stock Option Plan Awards        
Stock-based compensation expense by type of award:        
Stock-based compensation expense 590 1,348 2,513 4,847
Restricted stock units and restricted stock awards        
Stock-based compensation expense by type of award:        
Stock-based compensation expense 834 1,679 3,882 4,334
Employee Stock Purchase Plan        
Stock-based compensation expense by type of award:        
Stock-based compensation expense $ 141 $ 189 $ 535 $ 602