Commitments and Contingencies - Additional Information (Detail) - USD ($) |
1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Jan. 25, 2019 |
Feb. 28, 2021 |
Jan. 31, 2019 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Mar. 31, 2019 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2018 |
Dec. 31, 2020 |
|
| Commitment And Contingencies [Line Items] | ||||||||||
| Litigation settlement share issued | 500,000 | |||||||||
| Contingent loss on patent litigation settlement | $ (29,000) | $ 0 | $ (190,000) | $ 0 | ||||||
| Accrued liability | $ 600,000 | 6,182,000 | 6,182,000 | $ 6,667,000 | ||||||
| CAO Settlement Agreement | ||||||||||
| Commitment And Contingencies [Line Items] | ||||||||||
| Accrued liability | 700,000 | 700,000 | ||||||||
| CAO Settlement Agreement | Patent Litigation | ||||||||||
| Commitment And Contingencies [Line Items] | ||||||||||
| Settlement agreement date | January 25, 2019 | |||||||||
| Number of days litigation settlement to be paid in cash | 5 days | |||||||||
| Litigation settlement in cash | $ 500,000 | |||||||||
| Number of days litigation settlement shares to be issued | 30 days | |||||||||
| Litigation settlement share issued | 500,000 | |||||||||
| Number of days litigation settlement to be paid in value of stock consideration | 30 days | |||||||||
| Settlement agreement, terms | The Company agreed (i) to pay to CAO, within five days of the Effective Date, $500,000 in cash, (ii) to issue to CAO, within 30 days of the Effective Date, 500,000 restricted shares of common stock of the Company (the “Stock Consideration”), and (iii) to pay to CAO, within 30 days of December 31, 2021, an amount in cash equal to the difference (if positive) between $1,000,000 and the value of the Stock Consideration on December 31, 2021. | |||||||||
| Litigation settlement amount in cash equal to difference between value of stock consideration | $ 1,000,000 | |||||||||
| Contingent loss on patent litigation settlement | $ 1,500,000 | |||||||||
| Payment for litigation settlement in cash | $ 500,000 | |||||||||
| Loss on litigation settlement | $ (200,000) | |||||||||
| Accrued liability | $ 700,000 | $ 700,000 | $ 1,000,000.0 | |||||||