Leases (Details)		12 Months Ended
	Feb. 19, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jul. 01, 2019 USD ($)	Jun. 19, 2019 USD ($) ft²	Apr. 01, 2019 USD ($)	Feb. 25, 2019 USD ($) ft²	Dec. 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Jul. 31, 2015 ft²
Lessee, Lease, Description [Line Items]
Net rentable area | ft²										59,248
Term of lease										96 months
Tenant incentive									$ 1,400,000
Tenant improvement allowance used								$ 8,200,000
Lease expense extinguished from prior lease							$ 14,400,000
Total lease payments		$ 871,000
Lessee, operating lease, liability, payments		429,000
Operating lease, liability, payments, due year two		442,000
Noncash leasehold improvements		5,600,000
Deferred costs accumulated amortization		900,000
Operating lease, liability		778,000
Termination of lease		(1,600,000)
Reduction of lease liability		1,300,000
Operating lease, right-of-use asset		464,000
Rent expense		700,000	$ 1,300,000
February Lease
Lessee, Lease, Description [Line Items]
Net rentable area | ft²							24,562
Term of lease							51 months
Total lease payments		4,800,000					$ 4,800,000
Lessee, operating lease, liability, payments		600,000
Operating lease, liability, payments, due year two		1,200,000
Operating lease, liability, payments, due year three		1,200,000
Operating lease, liability, payments, due year four		1,200,000
Operating lease, liability, payments, due year five		600,000
New Premises
Lessee, Lease, Description [Line Items]
Net rentable area | ft²					8,727
Term of lease					2 years 6 months
Lessee, operating lease, liability, payments		100,000
Operating lease, liability, payments, due year two		400,000
Operating lease, liability, payments, due year three		400,000
Deferred costs accumulated amortization		200,000
Operating lease, liability		0
Initial direct cost liability				$ 800,000
Lease payments eliminated					$ 4,800,000
Reduction of lease liability		500,000
Operating lease, right-of-use asset				600,000
Deferred credit, operating lease liability				$ 200,000
Nitto
Lessee, Lease, Description [Line Items]
Relocation assistance payment	$ 100,000
Difference between the security deposits under the Prior Lease and Nitto’s prior lease	200,000
Rent reimbursement	$ 1,300,000
Lease modification impact		$ 400,000
Initial direct cost liability						$ 3,800,000
Operating lease, right-of-use asset						2,900,000
Deferred credit, operating lease liability						$ 900,000
Other Noncurrent Liabilities
Lessee, Lease, Description [Line Items]
Deferred rent balance			$ 8,000,000