v3.21.1

Notes Payable - Schedule of Notes Payable (Detail) - USD ($) | Feb. 01, 2021 | Jan. 31, 2021 | Jan. 30, 2021 | May 02, 2020 | Feb. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | May 31, 2019 | Nov. 30, 2018 | Oct. 31, 2018 | Jan. 31, 2018
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  | $ 4,348,000 |  | $ 16,359,000 |  |  |  |  |  |
Unamortized discount |  |  |  |  | (2,674,000) |  |  |  |  |  | $ (271,000)
Total carrying value |  |  | 4,348,000 |  | 13,685,000 |  |  |  |  |  |
Amount classified as current |  |  | 2,478,000 |  | 13,685,000 |  |  |  |  |  |
Amount classified as long-term |  |  | 1,870,000 |  |  |  |  |  |  |  |
0% Convertible Note Due January 2021 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  |  |  | 91,000 |  |  |  |  |  |
6% Promissory Note Due December 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  |  |  | 500,000 |  |  |  |  |  |
12% Convertible Notes Due October 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  |  |  | 1,775,000 |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  |  | $ (1,942,000) |
12% Convertible Notes Due November 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  | $ 400,000 |  |  | 400,000 | $ 400,000 |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  | $ (118,000) |  |
12% Convertible Notes Due May 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  |  |  | 1,500,000 |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  | $ (940,000) |  |  |
12% Convertible Notes Due July, August and September 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount | $ 4,235,000 |  |  |  | 4,235,000 | $ 4,235,000 |  |  |  |  |
Unamortized discount |  |  |  | $ (4,368,000) |  |  | $ (4,368,000) |  |  |  |
12% Secured Promissory Note Due September 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  |  |  | $ 7,858,000 |  |  |  |  |  |
6% Promissory Note Due February 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  | 1,250,000 |  |  |  |  |  |  |  |
1% Promissory Note Due April 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total face amount |  |  | $ 3,098,000 |  |  |  |  |  |  |  |

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