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Components of Basic and Diluted EPS Computations (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
EPS — basic and diluted:
Net loss (numerator)	$ (14,263)	$ (10,370)	$ (12,387)	$ (14,883)	$ (9,747)	$ (24,168)	$ (22,675)	$ (30,385)	$ (51,903)	$ (86,975)
Weighted average common shares (denominator)	206,689	199,906	188,054	187,434	161,397	153,597	140,054	120,911	195,584	144,136
Net loss per share	$ (0.07)	$ (0.05)	$ (0.07)	$ (0.08)	$ (0.06)	$ (0.16)	$ (0.16)	$ (0.25)	$ (0.27)	$ (0.60)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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