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Leases (Details) $ in Thousands		12 Months Ended
	Dec. 17, 2020 USD ($) ft²	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease renewal term		10 years
Operating lease cost		$ 5,300	$ 5,100
Variable lease cost		1,400	1,100
Operating rental expense				$ 2,600
Total commitment under lease		$ 41,991	$ 36,138	$ 0	$ 20,056
Richardson, Texas
Lessee, Lease, Description [Line Items]
Leased area (sq ft) | ft²	23,833
Total commitment under lease	$ 11,600
Minimum
Lessee, Lease, Description [Line Items]
Lease term		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term		11 years

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- Definition

Lessee, Operating Lease, Square Feet Of Leased Area

+ References

No definition available.

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

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- Definition

Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
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Present value of lessee's discounted obligation for lease payments from operating lease.

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- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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