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Investments in Joint Ventures - EnviroFlight - Additional Information (Details) - USD ($) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 | Feb. 29, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Cash paid in asset acquisition |  |  | $ 14,219,000 | $ 7,244,000 |
Shares issued in asset acquisition |  |  | 0 | 4,401,000 |
Contingent consideration assumed in asset acquisition |  |  | 0 | $ 3,660,000 |
Shares issued as payment of deferred consideration |  |  | 0 |  |
Investment |  |  | 21,904,000 |  | $ 23,655,000
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 |  |  | 2,826,000 |  | 2,081,000
EnviroFlight, LLC |  |  |  |  |
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 |  |  |
Additional capital contributions committed, remaining commitment |  |  | 2,750,000 |  |
Estimated fair value of investment |  | 5,425,000 |  |  |
Shares issued for contingent consideration (in shares) | 59,337 |  |  |  |
Shares issued as payment of deferred consideration | $ 1,583,000 |  |  |  |
Contingent consideration for commercial milestones payable in common stock, maximum |  | 4,000,000 |  |  |
EnviroFlight, LLC | Investments In Affiliates |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment |  |  | 5,673,000 |  | $ 4,189,000
EnviroFlight, LLC | 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 |  |  | $ 2,241,000 |  |
EnviroFlight, LLC | Patents, developed 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, LLC | Investors |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Membership interest |  | 50.00% |  |  |
Maximum additional capital contribution committed |  | $ 5,000,000 |  |  |

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