Deferred Revenue (Details) - USD ($)	1 Months Ended				3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Sep. 30, 2020	Jan. 31, 2020	Oct. 31, 2014	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2016	Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 9,103,000				$ 9,103,000		$ 9,103,000			$ 10,190,000
Baxter Healthcare Organization
Deferred Revenue Arrangement [Line Items]
Upfront payment				$ 20,000,000
Recognized deferred revenue					500,000	$ 1,000,000.0	500,000	$ 1,000,000.0
Deferred revenue	6,200,000				6,200,000		$ 6,200,000			7,200,000
Refund percentage							25.00%
Wanbang Biopharmaceutical
Deferred Revenue Arrangement [Line Items]
Upfront payment									$ 4,000,000.0
Recognized deferred revenue					53,000	100,000	$ 53,000	100,000
Deferred revenue	2,600,000				2,600,000		2,600,000			2,700,000
Sun Pharma Agreements
Deferred Revenue Arrangement [Line Items]
Upfront payment			$ 100,000
Recognized deferred revenue					2,500	5,000	2,500	5,000
Deferred revenue	85,000				85,000		85,000			90,000
Jeil Pharma Agreements
Deferred Revenue Arrangement [Line Items]
Upfront payment		$ 200,000
Recognized deferred revenue					2,500	$ 0	5,000	$ 0
Deferred revenue	200,000				$ 200,000		$ 200,000			$ 200,000
Drogsan Agreements
Deferred Revenue Arrangement [Line Items]
Upfront payment	$ 200,000