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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock-based compensation expense by type of award:        
Stock-based compensation expense $ 2,156 $ 809 $ 3,451 $ 1,327
Employee Stock Purchase Plan        
Stock-based compensation expense by type of award:        
Stock-based compensation expense 155 105 246 190
Stock options        
Stock-based compensation expense by type of award:        
Stock-based compensation expense $ 2,001 $ 704 $ 3,205 $ 1,137