Quarterly report pursuant to Section 13 or 15(d)

Summary of Warrant Activity (Detail)

v3.21.2
Summary of Warrant Activity (Detail) - Warrants
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Beginning Balance | shares 54,052
Exercised | shares (35,790)
Forfeited, cancelled, or expired | shares (407)
Ending Balance | shares 17,855
Warrants exercisable at September 30, 2021 | shares 17,855
Vested warrants expired during the period ended June 30, 2021 | shares (407)
Beginning Balance | $ / shares $ 0.62
Exercised | $ / shares 0.43
Forfeited, cancelled, or expired | $ / shares 10.00
Ending Balance | $ / shares 0.80
Warrants exercisable at September 30, 2021 | $ / shares 0.80
Vested warrants expired during the period ended September 30, 2021 | $ / shares $ 10.00