v3.20.4

Stock-Based Compensation - Additional Information (Detail) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Feb. 01, 2020 | Jun. 30, 2019 | Oct. 31, 2020 | Sep. 30, 2019 | May 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares outstanding under equity incentive plans |  |  |  |  | 180,000 |  |
Stock-based compensation expense |  |  |  |  | $ 673,000 |  |
Stock options granted under equity incentive plans |  |  | 0 |  | 180,000 |  |
Stock issued during period, values |  |  |  |  | $ 216,000 |  |
Reduction in value of warrants |  |  |  |  | 89,000 |  |
Compensation expense |  |  |  |  | $ 127,000 |  |
Expected life |  |  |  |  | 5 years |  |
Risk-free interest rate, minimum |  |  |  |  | 0.20% |  |
Risk-free interest rate, maximum |  |  |  |  | 0.30% |  |
Expected dividend yield |  |  |  |  | 0.00% |  |
Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares granted |  | 1,068,000 |  |  |  |  |
Expected annualized volatility rate |  |  |  |  | 95.00% |  |
Immediate Vesting Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected life |  |  |  |  | 2 years 6 months |  |
Graded Vested Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected life |  |  |  |  | 3 years 3 months 14 days |  |
Termination of Chief Financial Officer [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares granted |  |  |  | 5,357 |  |  |
Number of shares granted, value |  |  |  | $ 108,000 |  |  |
Directors and Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  | 60,000 |
Number of shares granted, value |  |  |  |  |  | $ 1,560,000 |
Stock-based compensation expense |  |  |  |  |  | $ 1,774,000 |
Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted shares granted |  |  |  |  |  | 10,000 |
Total value of restricted stock award |  |  |  |  |  | $ 260,000 |
Stock options granted under equity incentive plans |  |  |  |  | 180,000 |  |
Board of Directors [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares granted |  |  |  |  | 295,000 |  |
Number of shares granted, value |  |  |  |  | $ 390,000 |  |
Board of Directors [Member] | Common Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares granted | 80,000,000 |  |  |  |  |  |
Number of shares granted, value | $ 106,000 |  |  |  |  |  |
Restricted Stock Award [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 7,000 |  | $ 77,000 |  |
Restricted Stock Award [Member] | Termination of Chief Financial Officer [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares vested in period |  |  |  | 2,667 |  |  |
Number of shares vested in period, value |  |  |  | $ 69,000 |  |  |
Restricted Stock Award [Member] | Employees [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares granted, vesting period |  |  |  |  |  | 2 years |
Unregistered Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock issued during period, shares |  |  |  |  | 300,000 |  |
Reduction of warrants |  |  |  |  | 300,000 |  |
Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 79,000 |  |
2015 Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares outstanding under equity incentive plans |  |  |  |  |  |  | 180,000
Common stock available for future issuance |  |  |  |  |  |  | 263,000
2015 Equity Incentive Plan [Member] | Restricted Stock Award [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares outstanding under unvested restricted shares |  |  |  |  |  |  | 3,000

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