Annual report pursuant to Section 13 and 15(d)

Stockholder's Equity - Reserved Shares of Authorized but Unissued Common Stock (Detail)

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Stockholder's Equity - Reserved Shares of Authorized but Unissued Common Stock (Detail) - shares
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Total reserved shares of common stock 6,991,570 5,482,938
Common Stock Warrants [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock   1,460,955
Equity Incentive Plan [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock 6,991,570 4,021,983