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Equity Incentive Plans - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Shares    
Options outstanding, Beginning Balance, Shares | shares 1,462  
Options granted, Shares | shares 391  
Options exercised, Shares | shares (78)  
Options forfeited/canceled/expired, Shares | shares (151)  
Options outstanding, Ending Balance, Shares | shares 1,624 1,462
Options vested and expected to vest, ending balance, Shares | shares 1,538  
Options exercisable, ending balance, Shares | shares 819  
Wtd. Avg. Exercise Price    
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price (in dollars per share) | $ / shares $ 24.30  
Options granted, Wtd. Avg. Exercise Price (in dollars per share) | $ / shares 22.68  
Options exercised, Wtd. Avg. Exercise Price (in dollars per share) | $ / shares 16.03  
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price (in dollars per share) | $ / shares 24.48  
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price (in dollars per share) | $ / shares 24.31 $ 24.30
Options vested and expected to vest, ending balance, Wtd. Avg. Exercise Price (in dollars per share) | $ / shares 24.37  
Options exercisable, ending balance, Wtd. Avg. Exercise Price (in dollars per share) | $ / shares $ 24.88  
Options, Additional Disclosures    
Options outstanding, Remaining Contractual Term 7 years 2 months 1 day 7 years 2 months 12 days
Options vested and expected to vest, ending balance, Wtd. Avg., Remaining Contractual Term 7 years 29 days  
Options exercisable, ending balance, Wtd. Avg. Remaining Contractual Term 5 years 9 months 18 days  
Options outstanding, Aggregate Intrinsic Value | $ $ 314 $ 924
Options vested and expected to vest, ending balance, Aggregate Intrinsic Value | $ 314  
Options exercisable, ending balance, Aggregate Intrinsic Value | $ $ 314