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Net (Loss) per Share - Computation of Basic and Diluted Net (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Net (loss) $ 4,951 $ (5,100) $ (43) $ (654) $ (6,224) $ (67) $ 413 $ 155 $ (846) $ (5,723) $ (2,535)
Deemed dividends on preferred stock                 3,645 18,011 40
Amortization of preferred stock beneficial conversion feature                 6,902 6,663 82
NET LOSS ATTRIBUTABLE TO COMMON STOCKHOLDERS $ 2,260 $ (7,751) $ (2,682) $ (3,220) $ (14,197) $ (5,634) $ (5,154) $ (5,412) $ (11,393) $ (30,397) $ (2,657)
Basic weighted average common shares outstanding 86,676 79,617 79,413 78,650 78,490 78,145 77,448 76,068 79,426 77,542 60,526
Diluted weighted average shares outstanding 88,611 79,617 79,413 78,650 78,490 78,145 77,448 76,068 79,426 77,542 60,526
Basic net (loss) per share attributable to common stockholders $ 0.03 $ (0.10) $ (0.03) $ (0.04) $ (0.18) $ (0.07) $ (0.07) $ (0.07) $ (0.14) $ (0.39) $ (0.04)
Diluted net (loss) per share attributable to common stockholders $ 0.03 $ (0.10) $ (0.03) $ (0.04) $ (0.18) $ (0.07) $ (0.07) $ (0.07) $ (0.14) $ (0.39) $ (0.04)