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