Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock Option Activity (Detail)

v3.21.1
Stockholders' Equity - Summary of Stock Option Activity (Detail) - 2014 EIP and Inducement Plan - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Shares, beginning balance 7,851,886  
Granted, Shares 1,475,153  
Exercised, Shares (107,789)  
Forfeited or expired, Shares (168,822)  
Outstanding, Shares, ending balance 9,050,428 7,851,886
Outstanding, Weighted Average Exercise Price, beginning balance $ 22.89  
Granted, Weighted Average Exercise Price 17.23  
Exercised, Weighted Average Exercise Price 16.23  
Forfeited or expired, Weighted Average Exercise price 31.46  
Outstanding, Weighted Average Exercise Price, ending balance $ 21.89 $ 22.89
Outstanding, Weighted Average Remaining Contractual Term 6 years 10 months 24 days 6 years 4 months 24 days
Aggregate intrinsic value $ 7,595 $ 26,834