Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Marketable Securities and Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]      
Long-term debt, carrying value $ 3.1 $ 3.1 $ 3.3
Proceeds from sale of available-for-sale securities $ 1.3 $ 1.3  
2017 Warrants      
Schedule Of Available For Sale Securities [Line Items]      
Shares of common stock to be purchased with warrants 377,273 377,273