Leases (Narrative) (Details)			3 Months Ended
	Jun. 19, 2019 USD ($) ft²	Feb. 19, 2019 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	Jun. 30, 2019 USD ($)	Apr. 01, 2019 USD ($)	Mar. 31, 2019 USD ($)	Feb. 25, 2019 USD ($) ft²	Dec. 31, 2018 USD ($)	May 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Jul. 31, 2015 ft²
Lessee, Lease, Description [Line Items]
Net rentable area | ft²														59,248
Term of contract														96 months
Incentive from lessor													$ 1,400,000
Tenant improvement allowance												$ 8,200,000
Lease liability payments eliminated								$ 14,400,000
Operating lease payments due				$ 660,000
Noncash leasehold improvements			$ 5,600,000
Noncash gain due to reduction of lease liability			1,300,000
Deferred cost of liability					$ 900,000
Termination of lease cost			1,600,000
Operating lease liability				605,000					$ 0
Remaining 2020				$ 218,000
Other Noncurrent Liabilities
Lessee, Lease, Description [Line Items]
Deferred rent credit, noncurrent											$ 8,000,000.0
Nitto
Lessee, Lease, Description [Line Items]
Relocation assistance payment		$ 100,000
Security deposit difference payment		200,000
Rent reimbursement		$ 1,300,000
Lease net impact of modification			$ 400,000
Initial direct cost liability								3,800,000
ROU asset								2,900,000
Deferred credit, operating lease liabilities								$ 900,000
February Lease
Lessee, Lease, Description [Line Items]
Net rentable area | ft²										24,562
Term of contract										51 months
Operating lease payments due										$ 4,800,000
New Premises
Lessee, Lease, Description [Line Items]
Net rentable area | ft²	8,727
Term of contract	2 years 6 months
Lease liability payments eliminated	$ 4,800,000
Noncash gain due to reduction of lease liability	500,000
Deferred cost of liability							$ 200,000
Operating lease liability							$ 0
Initial direct cost liability						$ 800,000
ROU asset						600,000
Deferred credit, operating lease liabilities						$ 200,000
Remaining 2020	400,000
Base rent payments due 2021	$ 400,000