Annual report pursuant to Section 13 and 15(d)

Accrued Expenses - Additional Information (Detail)

v3.19.1
Accrued Expenses - Additional Information (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Other Accrued Liabilities, Current $ 795,974 $ 28,331
TDG Acquisition Company LLC [Member]    
Other Accrued Liabilities, Current $ 750,000