Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-based compensation expense by type of award:      
Stock-based compensation expense $ 7,294 $ 3,640 $ 1,451
Employee Stock Purchase Plan      
Stock-based compensation expense by type of award:      
Stock-based compensation expense 444 360 134
Stock options      
Stock-based compensation expense by type of award:      
Stock-based compensation expense $ 6,850 $ 3,280 $ 1,317