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Organization and Basis of Presentation - Additional Information (Detail)
$ in Thousands
3 Months Ended
Jul. 24, 2019
shares
Mar. 31, 2020
USD ($)
employee
segment
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
shares
Accounting Policies [Abstract]        
Number of operating segments | segment   1    
Reverse stock split conversion ratio 0.10      
Common stock, shares authorized (in shares) | shares 100,000,000.0 100,000,000   100,000,000
Revenue   $ 780 $ 1,775  
Accumulated deficit   177,691   $ 172,430
Cash and cash equivalents   $ 8,915   $ 14,055
Number of employees remaining after transition | employee   2