Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) l	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
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	$ 1.0	$ 2.4