Leases - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
Operating Leased Assets [Line Items]
Existence of option to extend		true
Lease option to extend, description		one or more options to renew, with renewal terms that can extend the lease term from one to ten years or more
Lease renewal term start year		1 year
Impairment of right-of use assets	$ 3,886,000
Written down of assets at salvage value	0	$ 0
Sublease income	324,000	1,122,000
Right of use asset	45,241,000	45,241,000
Lease liability	$ 57,523,000	$ 57,523,000
Weighted average remaining lease term	5 years 4 months 24 days	5 years 4 months 24 days
Weighted average discount rate	10.30%	10.30%
ASC 842
Operating Leased Assets [Line Items]
Right of use asset	$ 45,241,000	$ 45,241,000	$ 56,591,000
Lease liability	$ 57,438,000	$ 57,438,000	64,877,000
Decrease in long term liabilities upon adoption of ASU			6,500,000
Decrease in accrued expenses upon adoption of ASU			$ 1,800,000
Maximum
Operating Leased Assets [Line Items]
Operating leases initial term	12 months	12 months
Minimum
Operating Leased Assets [Line Items]
Lease renewal term end year	10 years	10 years