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Net Loss Per Share - Computation of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Shares (Detail) - shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 7,212,105 9,499,295
Unreleased Restricted Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 1,050,416 1,268,703
Options to Purchase Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 757,374 1,036,244
Convertible Senior Notes [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 1,807,141 3,597,174
Warrants Related to the Issuance of Convertible Senior Notes [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potentially dilutive securities excluded from computation of diluted shares outstanding 3,597,174 3,597,174