Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) l	Jun. 30, 2019 USD ($)
Maximum [Member]
Commitments and Contingencies [Line Items]
Bioreactors used in perfusion cell culture applications			2,000
Minimum [Member]
Commitments and Contingencies [Line Items]
Bioreactors used in perfusion cell culture applications			50
NGL Impact A [Member] | Research and Development Arrangement [Member]
Commitments and Contingencies [Line Items]
Payments to Navigo in connection with this program, which are recorded to research and development expenses | $	$ 0	$ 0	$ 0	$ 0