Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) ft²
Irvine, California Facility [Member]
Commitments and Contingencies
Estimated base rent under lease | $	$ 24,700
Lease expiration date	Feb. 28, 2023
Land subject to ground leases | ft²	27,600
Livingston [Member]
Commitments and Contingencies
Estimated base rent under lease | $	$ 7,600
Lease expiration date	Dec. 31, 2024
Land subject to ground leases | ft²	8,100
Hoofddorp [Member]
Commitments and Contingencies
Estimated base rent under lease | $	$ 5,400
Lease expiration date	May 31, 2023
Land subject to ground leases | ft²	7,600
Houston [Member]
Commitments and Contingencies
Estimated base rent under lease | $	$ 22,000
Lease expiration date	Jan. 31, 2024
Land subject to ground leases | ft²	21,476
Brentwood, Tennessee [Member]
Commitments and Contingencies
Estimated base rent under lease | $	$ 11,000
Lease expiration date	Aug. 31, 2024
Land subject to ground leases | ft²	4,190