Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2018 subsidiary lease shares	Dec. 31, 2017 shares	May 30, 2008
Business Acquisition [Line Items]
Wholly-owned subsidiaries | subsidiary	2
Anti-dilutive common shares excluded from calculation of income per common share (in shares)	24,717,000	12,521,550
Interest rate on restricted investment	8.75%
Number of property leases | lease	3
Convertible Preferred Shares
Business Acquisition [Line Items]
Issuance of Preferred Shares, net of issuance cost (in shares)	664,000	500,000
Stock Option
Business Acquisition [Line Items]
Anti-dilutive common shares excluded from calculation of income per common share (in shares)	6,849,000
Convertible Preferred Shares
Business Acquisition [Line Items]
Anti-dilutive common shares excluded from calculation of income per common share (in shares)	17,868,000
PADCo. | Monsanto
Business Acquisition [Line Items]
Business acquisition, percentage of outstanding shares acquired			100.00%