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Summary of Significant Accounting Policies - Summary of Reconciliation of Denominator Used in Calculation of Basic and Diluted 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
Earnings Per Share Basic And Diluted [Abstract]
Net loss	$ (11,492)	$ (18,663)	$ (18,225)	$ (15,448)	$ (11,535)	$ (10,583)	$ (9,521)	$ (8,075)	$ (63,828)	$ (39,714)	$ (45,562)
Weighted-average common shares outstanding - basic									38,529	36,827	35,197
Weighted-average common shares outstanding - diluted									38,529	36,827	35,197
Net loss per common share, basic and diluted	$ (0.29)	$ (0.48)	$ (0.48)	$ (0.41)	$ (0.31)	$ (0.29)	$ (0.26)	$ (0.22)	$ (1.66)	$ (1.08)	$ (1.29)

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

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