Deferred Revenue (Details) - USD ($)			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 07, 2020	Jan. 14, 2020	Oct. 31, 2014	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2016	Dec. 31, 2019
Deferred Revenue Arrangement [Line Items]
Deferred revenue				$ 10,738,000		$ 10,738,000			$ 12,076,000
Baxter Healthcare Organization
Deferred Revenue Arrangement [Line Items]
Upfront payment			$ 20,000,000
Recognized deferred revenue				500,000	$ 1,500,000	500,000	$ 1,500,000
Deferred revenue				7,700,000		$ 7,700,000			9,100,000
Refund eligible for, percent of upfront fee						25.00%
Partial refund						$ 5,000,000.0
Wanbang Biopharmaceutical
Deferred Revenue Arrangement [Line Items]
Upfront payment								$ 4,000,000.0
Recognized deferred revenue				53,000	$ 200,000	53,000	$ 200,000
Deferred revenue				2,800,000		2,800,000			$ 3,000,000.0
Sun Pharma Agreements
Deferred Revenue Arrangement [Line Items]
Upfront payment		$ 100,000
Recognized deferred revenue				2,500		7,500
Deferred revenue				92,500		92,500
Jeil Pharma Agreements
Deferred Revenue Arrangement [Line Items]
Upfront payment	$ 200,000
Recognized deferred revenue				$ 0		$ 0