Quarterly report pursuant to Section 13 or 15(d)

Leases, Other Commitments, and Contingencies - Additional Information (Detail)

v3.19.1
Leases, Other Commitments, and Contingencies - Additional Information (Detail)
3 Months Ended
Mar. 31, 2019
USD ($)
Options
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]      
Lease term 20 years    
Number of lease extension options | Options 4    
Extension term of lease agreement 5 years    
Total rent expense under operating lease $ 49,000 $ 81,000  
Forward purchase commitment amount 19,700,000    
Equipment [Member]      
Other Commitments [Line Items]      
Lease term     4 years
Restricted cash $ 1,500,000    
Maximum [Member] | Equipment [Member]      
Other Commitments [Line Items]      
Sale-leaseback that can be financed or leased     $ 1,100,000