Investments in Joint Ventures - EnviroFlight - Additional Information (Details) - USD ($)	1 Months Ended		9 Months Ended
	Oct. 31, 2016	Feb. 29, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Cash paid in asset acquisition			$ 7,244,000	$ 0
Shares issued in asset acquisition			4,401,000	0
Contingent consideration assumed in asset acquisition			3,660,000	$ 0
Investment			25,847,000		$ 9,977,000
Significant Unobservable Inputs (Level 3)
Schedule of Equity Method Investments [Line Items]
Fair value of financial liabilities measured at fair value on a recurring basis			3,839,000
EnviroFlight
Schedule of Equity Method Investments [Line Items]
Cash paid in asset acquisition		$ 4,244,000
Shares issued in asset acquisition (in shares)		136,340
Shares issued in asset acquisition		$ 4,401,000
Contingent consideration assumed in asset acquisition		3,660,000
Capital contributions		$ 3,000,000
Membership interest		50.00%
Maximum additional capital contribution committed		$ 5,000,000
Estimated fair value of investment		5,425,000
Contingent consideration for commercial milestones payable in common stock, maximum		4,000,000
EnviroFlight | Investments In Affiliates
Schedule of Equity Method Investments [Line Items]
Investment			4,611,000
EnviroFlight | Significant Unobservable Inputs (Level 3)
Schedule of Equity Method Investments [Line Items]
Fair value of financial liabilities measured at fair value on a recurring basis			$ 3,839,000
EnviroFlight | Patents, related technologies and know-how
Schedule of Equity Method Investments [Line Items]
Estimated fair value of developed technology acquired		$ 9,880,000
Expected useful life of intangible asset		21 years
EnviroFlight | Investors
Schedule of Equity Method Investments [Line Items]
Membership interest		50.00%
Maximum additional capital contribution committed		$ 5,000,000
EnviroFlight | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Shares issued for contingent consideration (in shares)	59,337
Shares issued for contingent consideration	$ 1,583,000