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v3.20.4

Secured Notes to Related Party - Additional Information (Details) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 05, 2016 USD ($) | Aug. 02, 2016 USD ($) shares | Jul. 29, 2011 shares | Aug. 31, 2018 USD ($) | Aug. 31, 2016 USD ($) | Apr. 30, 2011 USD ($) Day shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from convertible debt |  |  |  |  |  | $ 4,300,000 |  |  |
Amortization of debt discount |  |  |  |  |  |  | $ 1,429,000 | $ 1,050,000 | $ 890,000
Debt instrument, convertible, number shares of equity instruments | shares |  |  |  |  |  |  | 9,500,000 |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Convertible debt issuable in connection with private placement |  |  |  |  |  | $ 4,500,000 |  |  |
Debt instrument, interest rate |  |  |  |  |  | 6.00% |  |  |
Debt instrument, maturity date |  |  |  |  |  | May 02, 2021 |  |  |
Debt instrument conversion ratio multiple of principal |  |  |  |  |  | $ 1,000 |  |  |
Beneficial ownership after conversion |  |  |  |  |  | 9.99% |  |  |
Notice period associated with beneficial ownership percentage limitation convertible notes | Day |  |  |  |  |  | 61 |  |  |
Common shares registered for resale in connection with convertible notes | shares |  |  | 3,500,000 |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 10 years |  |  |
Paid-in-kind interest |  |  |  |  |  |  | $ 400,000 |  |
Debt instrument, additional debt discount |  |  |  |  |  |  | 400,000 |  |
Interest expense, debt, excluding amortization |  |  |  |  |  |  | 400,000 | 400,000 | 400,000
Amortization of debt discount |  |  |  |  |  |  | 1,400,000 | $ 1,100,000 | 900,000
Carrying value of debt |  |  |  |  |  |  | 7,100,000 |  |
Debt instrument, face amount |  |  |  |  |  |  | 7,600,000 |  |
Debt instrument, unamortized discount, total |  |  |  |  |  |  | $ 500,000 |  |
Convertible Notes | Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, number of shares issued for convertible notes | shares |  |  |  |  |  | 1,250 |  |  |
Term Loan | Tang Capital |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 8.00% |  |  |  |
Debt instrument, term |  |  |  |  | 2 years |  |  |  |
Carrying value of debt |  |  |  |  |  |  |  |  | 0
Debt agreement, maximum borrowing capacity |  |  |  |  | $ 100,000,000.0 |  |  |  |
Proceeds from issuance of long-term debt, total | $ 50,000,000.0 |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt, subject to achievement of corporate milestone |  | $ 50,000,000.0 |  |  |  |  |  |  |
Debt instrument, fee amount |  | $ 0 |  |  |  |  |  |  |
Debt instrument, number of warrants | shares |  | 0 |  |  |  |  |  |  |
Debt instrument, convertible, beneficial conversion feature |  | $ 0 |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 1,200,000
Debt outstanding principal paid |  |  |  | $ 25,000,000.0 |  |  |  |  |
Debt accrued interest paid |  |  |  | $ 200,000 |  |  |  |  |

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