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Common Stock Equivalents Excluded From Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents diluted net income (loss) per share inclusion anti-dilutive 7,181 7,984
RSUs    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents diluted net income (loss) per share inclusion anti-dilutive 1,043 1,430
Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents diluted net income (loss) per share inclusion anti-dilutive 562 576
Warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents diluted net income (loss) per share inclusion anti-dilutive 40 705
Shares of Common Stock Issuable Upon Conversion of Series B Convertible Preferred Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents diluted net income (loss) per share inclusion anti-dilutive 5,536 5,273