Quarterly report pursuant to Section 13 or 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
Jun. 30, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Total reserved shares of common stock 7,743,416 5,482,938
Common Stock Warrants [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock 729,483 1,460,955
Equity Incentive Plans [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock 7,013,933 4,021,983