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Basis Of Presentation And Significant Accounting Policies - Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Loss Per Share [Line Items]                      
Vested restricted stock units used to compute basic net loss per share                 10,240 0 5,063
Earnings Per Share, Basic and Diluted [Abstract]                      
Net loss $ 1,978 $ (283) $ 998 $ 11,609 $ 678 $ 19,120 $ 1,097 $ 745 $ 14,302 $ 21,640 $ 2,475
Shares used to compute basic net loss per share (in dollars per share)                 19,594,000 19,210,000 18,571,000
Shares used to compute diluted net loss per share (in dollars per share)                 20,067,000 19,690,000 18,878,000
Earnings Per Share, Basic (in dollars per share) $ 0.10 $ (0.01) $ 0.05 $ 0.60 $ 0.03 $ 0.99 $ 0.06 $ 0.04 $ 0.73 $ 1.13 $ 0.13
Earnings Per Share, Diluted (in dollars per share) $ 0.10 $ (0.01) $ 0.05 $ 0.58 $ 0.03 $ 0.97 $ 0.06 $ 0.04 $ 0.71 $ 1.10 $ 0.13
Stock Options                      
Earnings Per Share, Basic and Diluted [Abstract]                      
Stock options                 398,000 449,000 307,000
Restricted Stock Units (RSUs)                      
Earnings Per Share, Basic and Diluted [Abstract]                      
Stock options                 75,000 31,000 0
Stock Options                      
Earnings Per Share, Basic and Diluted [Abstract]                      
Antidilutive common shares excluded from computation of diluted net loss                 15,844 984 66,917