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Summary of Stock-Based Compensation Recognized (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Number of shares of common stock issued to certain board members in lieu of cash compensation |  | 51,056 | 24,235
Total stock-based compensation |  | $ 3,627 | $ 3,204
General and Administrative |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total stock-based compensation | [1] | 2,140 | 2,152
General and Administrative | Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Total stock-based compensation |  | $ 300 | $ 200
[1] | Included in general and administrative stock-based compensation for the years ended December 31, 2020 and 2019 is $0.3 million and $0.2 million in expense related to 51,056 shares and 24,235 shares of common stock, respectively, issued to certain board members in lieu of their cash compensation.

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