Related Parties (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Related parties
Revenue		$ 1,022,000	$ 2,757,000
Deferred revenue, current		14,602,000	22,000
Deferred revenue, noncurrent		5,000,000
Capitalized contract cost, Current		1,537,000
Capitalized contract cost, Noncurrent		526,000
License Agreement
Related parties
Revenue		0
Deferred revenue, current		14,600,000
Deferred revenue, noncurrent		5,000,000
Capitalized contract costs		2,100,000
Capitalized contract cost, Current		1,500,000
Capitalized contract cost, Noncurrent		526,000
Shenzen Hepalink Pharmaceutical Group Co., Ltd.("Hepalink")
Related parties
Reduction to operating expenses on reimbursed to JV entity		(1,500,000)	(360,000,000)
Serum International B.V. ("SIBV") | License Agreement
Related parties
Deferred revenue, current		14,600,000
Deferred revenue, noncurrent		5,000,000
Capitalized contract costs		2,100,000
Capitalized contract cost, Current		1,500,000
Capitalized contract cost, Noncurrent		526,000
Serum International B.V. ("SIBV")
Related parties
Issuance of common stock (in shares)	801,820
Issuance of stock	$ 10,000,000
Other receivables | Shenzen Hepalink Pharmaceutical Group Co., Ltd.("Hepalink")
Related parties
Outstanding receivable for reimbursable expenses		$ 152,000	$ 360,000