Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.19.3
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
lease
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
lease
Sep. 30, 2018
USD ($)
Other Commitments [Line Items]        
Number of leases | lease 4   4  
Expenses incurred for the properties listed   $ 0.1   $ 0.4
Property operating expense        
Other Commitments [Line Items]        
Operating Lease, Cost $ 0.1   $ 0.4  
Line of credit        
Other Commitments [Line Items]        
Letters of credit, outstanding $ 8.3   $ 8.3