Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Outstanding Warrants (Detail)

v3.20.1
Common Stock - Summary of Outstanding Warrants (Detail)
 3 Months Ended
Mar. 31, 2020
$ / shares
shares
Series A-1 Warrants [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 2,175
Exercise price per Share | $ / shares $ 264.0000
Expiration Date 2020-10
Warrants Issued In September 2017 [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 8,224
Exercise price per Share | $ / shares $ 34.9600
Expiration Date 2023-03
Warrants Issued In June 2018 [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 2,282,000
Exercise price per Share | $ / shares $ 4.0000
Expiration Date 2023-06
Warrants Issued in October 2018 [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 624,313
Exercise price per Share | $ / shares $ 3.1445
Expiration Date 2023-10
Warrants Issued in May 2019 [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 1,200,000
Exercise price per Share | $ / shares $ 4.5000
Expiration Date 2025-05
Warrants Issued in December 2019 [Member]  
Class of Warrant or Right [Line Items]  
Total Outstanding and Exercisable | shares 23,000,000
Exercise price per Share | $ / shares $ 0.6000
Expiration Date 2024-12