Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities and Fair Value Measurements - Additional Information (Detail)

v3.19.1
Marketable Securities and Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]    
Shares of common stock to be purchased with warrants 3,521,735 3,521,735
Long-term debt, carrying value $ 3.2 $ 3.3
2017 Warrants    
Schedule Of Available For Sale Securities [Line Items]    
Shares of common stock to be purchased with warrants 377,273 377,273