Intangible Assets and Goodwill - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items]
Impairment of goodwill (note 8)	$ 43,836,000	$ 14,811,000
Intangible assets	0	43,836,000
Tax benefit related to decrease in deferred tax liability for indefinite delay of further development	12,700,000
Income tax benefit corresponding to impairment charge	12,656,000	4,282,000
Impairment of goodwill	22,471,000	0
Goodwill	0	$ 22,471,000
Intangible Assets, Net (Including Goodwill)	0
In Process Research and Development, cccDNA Sterilizers [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of goodwill (note 8)	43,800,000
Intangible assets	$ 0