Collaborative Arrangements - Master Collaboration and Research Agreement and Stock Purchase Agreement (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payments to acquire other investments				$ 1,000,000	$ 0
Contract with customer, liability	$ 5,045,000	$ 5,045,000		5,045,000		$ 2,044,000
Revenues		14,967,000	$ 12,319,000	29,637,000	27,901,000
Research and Development Revenue [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues		10,463,000	$ 6,070,000	20,033,000	$ 13,665,000
MCRA [Member] | Molecular Assemblies, Inc. [Member] | Research and Development Revenue [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues		0		0
MCRA [Member] | Molecular Assemblies, Inc. [Member] | Fixed Consideration [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of days for payment	30 days
MCRA [Member] | Molecular Assemblies, Inc. [Member] | Bonus Goal Met [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of days for payment	30 days
CESA [Member] | Molecular Assemblies, Inc. [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Aggregate commercial sales, milestone	$ 5,000,000.0
CESA [Member] | Molecular Assemblies, Inc. [Member] | Royalty [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contract with customer, liability	$ 500,000	$ 500,000		$ 500,000
Molecular Assemblies, Inc. [Member] | Series A Preferred Stock [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of shares acquired in an equity method investment	1,587,050	1,587,050		1,587,050
Payments to acquire other investments	$ 1,000,000.0