Acquisition of Bellwether Bio - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Contingent liability from business acquisition		$ 1,065	$ 0	$ 0
Re-valuation of contingent consideration		300	$ 0	$ 0
Bellweather Bio, Inc.
Business Acquisition [Line Items]
Total purchase consideration	$ 8,700
Cash paid upon closing	7,600
Contingent liability from business acquisition	1,100	1,400
Identified intangible assets	$ 6,700
Weighted Average Useful Life	10 years
Re-valuation of contingent consideration		300
Acquisition related costs		400
Commercialization Milestones | Bellweather Bio, Inc.
Business Acquisition [Line Items]
Maximum contingent liability	$ 10,000
Earn-Out Consideration | Bellweather Bio, Inc.
Business Acquisition [Line Items]
Maximum contingent liability	10,000
Fair value, measurements, recurring
Business Acquisition [Line Items]
Contingent liability from business acquisition		1,365
Fair value, measurements, recurring | Level 2
Business Acquisition [Line Items]
Contingent liability from business acquisition		$ 0
Covenants Not To Compete | Bellweather Bio, Inc.
Business Acquisition [Line Items]
Identified intangible assets	$ 2,500
Weighted Average Useful Life	6 years