Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail)

v3.8.0.1
Subsequent Events - Additional Information (Detail) - Subsequent Event [Member]
1 Months Ended
Jan. 31, 2018
USD ($)
Subsequent Event [Line Items]  
Proceeds from sale of stock $ 38,999,989
Common stock, discount on shares $ 1,000,000