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Net Loss Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Earnings Per Share [Abstract]                      
Net loss $ 409 $ (3,890) $ (3,468) $ (4,911) $ (3,518) $ (6,048) $ (7,369) $ (8,903) $ (11,860) $ (25,838) $ (37,786)
Weighted-average shares used in computing basic and diluted net loss per share (in shares)                 52,342 50,141 37,604
Basic and diluted net loss per share (in USD per share)                 $ (0.23) $ (0.52) $ (1.00)