Leases - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 4,385,000	$ 4,385,000
Operating lease liabilities	4,462,000	4,462,000
Current portion of operating lease liability	1,596,000	1,596,000
Operating lease payments	$ 411,000	$ 1,115,000
Operating lease, weighted average remaining lease term (in years)	4 years 3 months 11 days	4 years 3 months 11 days
Operating lease, weighted average discount rate, percent	5.30%	5.30%
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	1 year	1 year
Lessee, operating lease, lease not yet commenced, operating lease expense	$ 3,000,000	$ 3,000,000
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	7 years	7 years
Lessee, operating lease, lease not yet commenced, operating lease expense	$ 4,000,000	$ 4,000,000
Operating Leases Commenced
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	1,000,000	1,000,000
Operating lease liabilities	$ 0	0
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets				$ 5,046,000
Operating lease liabilities				$ 5,131,000
2019 French Restructuring Obligation
Lessee, Lease, Description [Line Items]
Operating lease, impairment loss		$ 826,000
Scenario, Forecast | 2019 French Restructuring Obligation
Lessee, Lease, Description [Line Items]
Early termination payment			$ 820