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Net Loss Per Share - Calculation of Basic & Diluted Net Loss (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]    
Net loss attributable to common stockholders $ (29,400) $ (45,020)
Basic and diluted:    
Weighted average shares outstanding (in shares) 56,106 36,569
Less: weighted average restricted shares outstanding (in shares) (33) (124)
Shares used in calculation of basic and diluted net loss per common share (in shares) 56,073 36,445
Net loss per common share: Basic and diluted (in USD per share) $ (0.52) $ (1.24)