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Fair Value Measurements - Summary of Cash and Cash Equivalents and Short Term Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, amortized cost and estimated fair value | $ 949 | $ 1,070
Cash and cash equivalents, amortized cost and estimated fair value | 16,664 | 9,515
Restricted cash, amortized cost and estimated fair value | 50 | 50
Short-term investments, amortized cost and estimated fair value |  | 5,089
Money market securities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents, amortized cost and estimated fair value | 15,715 | 8,445
Restricted cash, amortized cost and estimated fair value | $ 50 | 50
Corporate bonds and commercial paper [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Short-term investments, amortized cost and estimated fair value |  | $ 5,089

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