Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Cash and Cash Equivalents (Detail)

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Fair Value Measurements - Summary of Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, amortized cost and estimated fair value $ 550  
Cash and cash equivalents, amortized cost and estimated fair value 12,156 $ 16,664
Restricted cash, amortized cost and estimated fair value 50  
Money market securities [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash equivalents, amortized cost and estimated fair value 11,606  
Restricted cash, amortized cost and estimated fair value $ 50