Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Stockholders' Equity - Summary of Stock Option Activity (Detail) - 2014 EIP and Inducement Plan
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Shares, beginning balance | shares 6,934,262
Granted, Shares | shares 2,341,925
Exercised, Shares | shares (118,719)
Forfeited or expired, Shares | shares (661,452)
Outstanding, Shares, ending balance | shares 8,496,016
Outstanding, Weighted Average Exercise Price, beginning balance | $ / shares $ 28.25
Granted, Weighted Average Exercise Price | $ / shares 11.63
Exercised, Weighted Average Exercise Price | $ / shares 13.52
Forfeited or expired, Weighted Average Exercise price | $ / shares 31.15
Outstanding, Weighted Average Exercise Price, ending balance | $ / shares $ 23.65
Outstanding, Weighted Average Remaining Contractual Term 6 years 7 months 6 days
Aggregate intrinsic value | $ $ 8,270