Leases - Additional Information (Details)			3 Months Ended
	Oct. 01, 2020	Oct. 15, 2019 USD ($) ft²	Mar. 31, 2021 USD ($) ft²	Mar. 31, 2020 USD ($)
Lessee Lease Description [Line Items]
Cash paid for amounts included in the measurement of lease liabilities			$ 800,000
Operating lease, expense			800,000
Operating lease right-of-use asset			4,509,000	$ 8,369,000
Operating lease liability			$ 4,635,000
Plano Texas
Lessee Lease Description [Line Items]
Operating lease, existence of option to extend	true
Operating lease, option to extend			extending through June 30, 2022
Lease expiration date	Jun. 30, 2022
Operating lease, renewal Term	3 months
Plano Texas | Office Space
Lessee Lease Description [Line Items]
Area of real estate property | ft²			122,000
Plano Texas | Office And Laboratory Space | 2019 Lease Agreement
Lessee Lease Description [Line Items]
Area of real estate property | ft²		327,400
Operating lease, existence of option to extend		true
Renewal lease term, option one			two consecutive five-year renewal periods
Lease initial term		16 years
Renewal lease term, option two			one ten-year renewal period
Operating lease right-of-use asset		$ 0
Operating lease liability		0
Leasehold improvement maximum amount funded by landlord		31,300,000
Leasehold incentive obligation included in other long-term liabilities			$ 2,700,000
Initial annual base rent expense		$ 13,300,000
Percentage of increase in base rent per annum after two years		1.95%
Irving Texas
Lessee Lease Description [Line Items]
Operating lease, existence of option to extend			true
Operating lease, option to extend			extending through April 30, 2022
Lease expiration date			Apr. 30, 2022
Renewal lease term, option one			four successive three-month periods
Irving Texas | Maximum
Lessee Lease Description [Line Items]
Operating lease, renewal Term			3 months
Irving Texas | Office And Laboratory Space
Lessee Lease Description [Line Items]
Area of real estate property | ft²			34,890