Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Stockholders' Equity - Summary of Stock-based Compensation Expense Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock-based compensation expense by type of award:    
Stock-based compensation expense $ 3,586 $ 3,381
Stock Option Plan Awards    
Stock-based compensation expense by type of award:    
Stock-based compensation expense 1,147 1,951
Restricted stock units and restricted stock awards    
Stock-based compensation expense by type of award:    
Stock-based compensation expense 2,257 1,239
Employee Stock Purchase Plan    
Stock-based compensation expense by type of award:    
Stock-based compensation expense $ 182 $ 191