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Reconciliation of Weighted Average Shares Used in Computation of Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share Disclosure [Line Items]        
Net income (loss) available to common stockholders $ (18,559) $ (16,742) $ (54,803) $ (35,058)
Shares used in loss per share 23,106 21,616 23,103 19,865
Loss per share $ (0.80) $ (0.77) $ (2.37) $ (1.77)