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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares that were Excluded from Computation of Diluted Net Loss per Share of Common Stock (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-based awards [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potential common shares excluded from computation of net loss per share 12,820,081 9,925,584 11,829,378 9,815,543
Convertible senior notes [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potential common shares excluded from computation of net loss per share 1,088,699 1,500,618 1,088,699 1,503,118
Warrants [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potential common shares excluded from computation of net loss per share   270,027   286,010