Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share - Summary of Basic and Diluted Earnings Per Share (Detail)

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Net Loss Per Share - Summary of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net loss $ (8,104) $ (4,714) $ (2,229) $ (4,851) $ 311 $ (13,935) $ (14,422) $ 1,847 $ (19,898) $ (26,199) $ (9,187)
Denominator:                      
Weighted Average Number of Shares Outstanding, Basic                 71,005 68,490 66,252
Dilutive common stock equivalents (shares)                 0 0 0
Weighted average common shares outstanding-diluted (shares)                 71,005 68,490 66,252
Net loss per share:                      
Basic (usd per share) $ (0.11) $ (0.07) $ (0.03) $ (0.07) $ 0.00 $ (0.20) $ (0.21) $ 0.03 $ (0.28) $ (0.38) $ (0.14)
Diluted (usd per share) $ (0.11) $ (0.07) $ (0.03) $ (0.07) $ 0.00 $ (0.20) $ (0.21) $ 0.03 $ (0.28) $ (0.38) $ (0.14)