Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Accrued construction costs	$ 19,981	$ 22,811
Accrued wages and benefits	8,974	7,541
Accrued inventory purchases	5,792	7,194
Accrued tax withholdings	5,281	187
Accrued selling fees and rebates	3,963	1,577
Accrued costs for product launch	3,953
Accrued clinical expenses	3,819	2,510
Accrued operating expenses	2,517	1,885
Accrued R&D licensing fees	384	384
Deferred revenue	75	218
Total accrued expenses	$ 54,739	$ 44,307