Leases - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019
Lessee Lease Description [Line Items]
Remaining operating lease terms		6 years		6 years
Operating lease liabilities	[1]	$ 10,335,000		$ 10,335,000
Operating right-of-use assets	[1]	8,606,000		8,606,000
Operating lease rent expense		$ 655,000	$ 545,000	$ 1,800,000	$ 1,600,000
ASU 2016-02
Lessee Lease Description [Line Items]
Lease renewal term		5 years		5 years
Operating lease, existence of option to terminate [true false]				true
Operating lease, Option to terminate description				Certain lease arrangements contain extension option which are typically around 5 years.
Operating lease liabilities						$ 9,900,000
Operating right-of-use assets		$ 8,606,000		$ 8,606,000		$ 8,000,000
ASU 2016-02 | Minimum
Lessee Lease Description [Line Items]
Remaining operating lease terms		1 year		1 year
ASU 2016-02 | Maximum
Lessee Lease Description [Line Items]
Remaining operating lease terms		10 years		10 years

[1] The adoption of ASU 2016-02, Leases (Topic 842) in the first quarter of 2019 resulted in the recognition of right-of-use assets and lease liabilities on balance sheet.