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Equity Plans - Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Options Outstanding    
Options Outstanding, Beginning balance 2,438,151  
Options Outstanding, Options granted 1,005,400  
Options Outstanding, Options exercised (142,014)  
Options Outstanding, Options forfeited (148,058)  
Options Outstanding, Ending balance 3,153,479 2,438,151
Options Outstanding, Options exercisable 1,311,184  
Options Outstanding, Options vested and expected to vest 3,153,479  
Weighted-Average Exercise Price Per Share    
Weighted-Average Exercise Price Per Share, Beginning balance $ 11.51  
Weighted-Average Exercise Price Per Share, Options granted 13.51  
Weighted-Average Exercise Price Per Share, Options exercised 2.79  
Weighted-Average Exercise Price Per Share, Options forfeited 14.99  
Weighted-Average Exercise Price Per Share, Ending balance 12.37 $ 11.51
Weighted-Average Exercise Price Per Share, Options exercisable 11.05  
Weighted-Average Exercise Price Per Share, Options vested and expected to vest $ 12.37  
Weighted-Average Remaining Contractual Life (years)    
Weighted-Average Remaining Contractual Life (years) 8 years 2 months 16 days  
Weighted-Average Remaining Contractual Life (years), Options exercisable 7 years 5 months 23 days  
Weighted-Average Remaining Contractual Life (years), Options vested and expected to vest 8 years 2 months 16 days 8 years 3 months 4 days
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Options Outstanding $ 7.8  
Aggregate Intrinsic Value, Options exercisable 4.6  
Aggregate Intrinsic Value, Options vested and expected to vest $ 7.8  
Options, weighted-average grant-date fair value $ 8.35