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v3.21.2

Borrowings - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 13, 2021 USD ($) Tranche | Apr. 09, 2020 USD ($) | Mar. 07, 2019 USD ($) d $ / shares | Jan. 31, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 31,185,000 |  | $ 31,185,000 |  |
Payment of debt issuance costs |  |  |  |  |  |  | 0 | $ 494,000 |
Loss on extinguishment of debt |  |  |  |  | 0 | $ 0 | 2,725,000 | 806,000 |
Net carrying amount of convertible debt and derivative liability |  |  |  |  | 10,805,000 |  | 10,805,000 |  | $ 16,516,000
Amortization of debt issuance costs and discount |  |  |  |  | 413,000 | 311,000 | 937,000 | 910,000 |
SVB |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum outstanding term loan principal percentage for financial covenant waived | 50.00% |  |  |  |  |  |  |  |
Loan and Security Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Fair value of loan payable |  |  |  |  | $ 29,300,000 |  | $ 29,300,000 |  |
Loan and Security Agreement | Level 3 Inputs | Secured Spread |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, measurement input |  |  |  |  | 9.39 |  | 9.39 |  |
Loan and Security Agreement | Level 3 Inputs | Risk Free Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, measurement input |  |  |  |  | 0.64 |  | 0.64 |  |
Loan and Security Agreement | Level 3 Inputs | Secured Yield |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, measurement input |  |  |  |  | 10.02 |  | 10.02 |  |
Term Loan | Loan and Security Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes maturity date | Mar. 03, 2025 |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 9.05% |  |  |  |  |  |  |  |
Debt instrument maturity date subject to occurrence of certain conditions | May 01, 2025 |  |  |  |  |  |  |  |
Term Loan | Loan and Security Agreement | Prime Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 5.80% |  |  |  |  |  |  |  |
Term Loan | Loan and Security Agreement | Hercules Capital Inc. and Silicon Valley Bank |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount | $ 60,000,000.0 |  |  |  |  |  |  |  |
Number of available tranches | Tranche | 4 |  |  |  |  |  |  |  |
Initial Tranche of Term Loan | Loan and Security Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Additional borrowing amount available | $ 20,000,000.0 |  |  |  |  |  |  |  |
Second Tranche of Term Loan | Loan and Security Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Additional borrowing amount available | 10,000,000.0 |  |  |  |  |  |  |  |
Third Tranche of Term Loan | Loan and Security Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Additional borrowing amount available | 5,000,000.0 |  |  |  |  |  |  |  |
Fourth Tranche of Term Loan | Loan and Security Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Additional borrowing amount available | 25,000,000.0 |  |  |  |  |  |  |  |
Increment debt amount | $ 5,000,000.0 |  |  |  |  |  |  |  |
April 2020 Note Purchase Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  | $ 10,000,000.0 |  |  |  |  |  |  |
Date of issuance and sale of notes |  | Apr. 09, 2020 |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  | $ 9,500,000 |  |  |  |  |  |  |
Payment of debt issuance costs |  | $ 500,000 |  |  |  |  |  |  |
Fair value of notes |  |  |  |  |  |  |  |  | 7,400,000
Conversion of convertible note, amount |  |  |  | $ 6,000,000.0 |  |  |  |  |
Conversion of convertible note exchanged for shares | shares |  |  |  | 959,080 |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 2,700,000 |  |  |  |  |
Net carrying amount of convertible debt and derivative liability |  |  |  | 4,800,000 |  |  |  |  |
Fair value of the consideration issued |  |  |  | $ 7,500,000 |  |  |  |  |
Senior Convertible Note Purchase Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount |  |  | $ 16,000,000.0 |  |  |  |  |  |
Notes maturity date |  |  | Mar. 15, 2025 |  |  |  |  |  |
Date of issuance and sale of notes |  |  | Mar. 07, 2019 |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  | $ 14,700,000 |  |  |  |  |  |
Payment of debt issuance costs |  |  | $ 1,300,000 |  |  |  |  |  |
Senior convertible notes |  |  |  |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |
Unamortized debt issuance cost |  |  |  |  | 400,000 |  | 400,000 |  |
Bifurcated embedded conversion option derivative liability |  |  |  |  | 800,000 |  | 800,000 |  |
Derivative, fair value |  |  |  |  | 7,000,000.0 |  | 7,000,000.0 |  |
Gain on fair value adjustment of derivative liability |  |  |  |  | 1,400,000 | 2,100,000 | 1,900,000 | 2,600,000 |
Amortization of debt issuance costs and discount |  |  |  |  | 200,000 | $ 300,000 | 700,000 | $ 800,000 |
Fair value of convertible debt and derivative liability |  |  |  |  | $ 11,500,000 |  | $ 11,500,000 |  | $ 12,900,000
Purchase price as percentage of principal amount |  |  | 100.00% |  |  |  |  |  |
Interest rate |  |  | 6.00% |  |  |  |  |  |
Payment terms |  |  |  |  |  |  | The March 2019 Notes bear interest at a rate of 6.0% per annum payable semiannually in arrears on March 15 and September 15 of each year, beginning September 15, 2019. The March 2019 Notes will mature on March 15, 2025, unless earlier converted, redeemed or repurchased. |  |
Conversion terms |  |  |  |  |  |  | holder of the March 2019 Notes may convert their March 2019 Notes at their option at any time prior to the close of business on the business day immediately preceding March 15, 2025 into shares of the Company’s common stock. |  |
Conversion rate, number of shares to be issued per $1000 of principal (in shares) |  |  | 73.9096 |  |  |  |  |  |
Principal amount of notes used as the denominator for conversion into notes |  |  | $ 1,000 |  |  |  |  |  |
Initial conversion price of notes | $ / shares |  |  | $ 13.53 |  |  |  |  |  |
Conversion rate, number of shares to be issued per $1000 of principal (in shares) after adjustment to certain events |  |  | 81 |  |  |  |  |  |
Principal amount of notes used as the denominator for conversion into notes after adjustment of certain events |  |  | $ 1,000 |  |  |  |  |  |
Convertible notes, redemption start date |  |  | Mar. 15, 2022 |  |  |  |  |  |
Convertible notes, threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |  |
Convertible notes, threshold trading days | d |  |  | 20 |  |  |  |  |  |
Convertible notes, threshold consecutive trading days | d |  |  | 30 |  |  |  |  |  |
Redemption price as percentage of the principal amount |  |  | 100.00% |  |  |  |  |  |
Redemption price as percentage of the principal amount subject to certain exceptions |  |  | 100.00% |  |  |  |  |  |

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