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Loss Per Common Share - Schedule of Basic and Diluted Loss Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net loss		$ (9,415)	$ (14,833)
Net loss attributable to Series A Preferred Stock (a)	[1]	(21)	(463)
Income attributable to common stockholders - basic and diluted		$ (9,394)	$ (14,370)
Denominator:
Weighted-average number of common shares used in loss per share - basic and diluted		80,484,113	27,670,118
Loss per share - basic and diluted		$ (0.12)	$ (0.52)
[1] The Series A Preferred Stock participates in income and losses

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Net income loss available to common stockholders basic and diluted.

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Net income loss available to Series A preferred stock.

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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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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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