Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Material Changes in Financial Condition (Detail)

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Commitments and Contingencies - Material Changes in Financial Condition (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]        
Total Assets $ 19,084 $ 9,892    
Total Liabilities 3,282 2,013    
Total Stockholders' Equity $ 15,802 $ 7,879 $ 610 $ 1,840