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Reconciliation of Numerator and Denominator Used in Computation of Basic and Diluted Net Income Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator for Basic and Diluted:
Net loss used for basic calculation	$ (16,205)	$ (14,192)	$ (13,282)	$ (13,885)	$ (11,486)	$ (13,418)	$ (17,083)	$ (18,598)	$ (57,564)	$ (60,585)	$ (62,906)
Denominator:
Basic weighted average number of shares outstanding									131,663	108,221	101,826
Diluted weighted average number of shares outstanding									131,663	108,221	101,826
Net loss per share:
Basic	$ (0.12)	$ (0.11)	$ (0.10)	$ (0.11)	$ (0.10)	$ (0.12)	$ (0.16)	$ (0.18)	$ (0.44)	$ (0.56)	$ (0.62)
Diluted	$ (0.12)	$ (0.11)	$ (0.10)	$ (0.11)	$ (0.10)	$ (0.12)	$ (0.16)	$ (0.18)	$ (0.44)	$ (0.56)	$ (0.62)

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