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Investments in Joint Ventures - EnviroFlight - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Feb. 29, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Investments In Joint Venture [Line Items] |  |  |  |  |
Cash paid in asset acquisition |  |  | $ 7,244,000 | $ 0 | $ 0
Shares issued in asset acquisition |  |  | 4,401,000 | 0 | 0
Contingent consideration assumed in asset acquisition |  |  | 3,660,000 | 0 | 0
Shares issued as payment for contingent consideration |  |  | 1,583,000 | 0 | $ 0
Investment |  |  | 23,655,000 | $ 9,977,000 |
EnviroFlight, LLC |  |  |  |  |
Schedule Of Investments In Joint Venture [Line Items] |  |  |  |  |
Cash paid in asset acquisition |  | $ 4,244,000 |  |  |
Shares issued in asset acquisition, shares |  | 136,340 |  |  |
Shares issued in asset acquisition |  | $ 4,401,000 |  |  |
Contingent consideration assumed in asset acquisition |  | 3,660,000 |  |  |
Capital contribution |  | $ 3,000,000 |  |  |
Membership interest |  | 50.00% |  |  |
Maximum additional capital contributions committed |  | $ 5,000,000 |  |  |
Estimated fair value of investment |  | 5,425,000 |  |  |
Shares issued as payment for contingent consideration, shares | 59,337 |  |  |  |
Shares issued as payment for contingent consideration | $ 1,583,000 |  |  |  |
Contingent consideration for commercial milestones payable in common stock, maximum |  | $ 4,000,000 |  |  |
Investor | EnviroFlight, LLC |  |  |  |  |
Schedule Of Investments In Joint Venture [Line Items] |  |  |  |  |
Membership interest |  | 50.00% |  |  |
Maximum additional capital contributions committed |  | $ 5,000,000 |  |  |
Patents, developed technologies and know-how | EnviroFlight, LLC |  |  |  |  |
Schedule Of Investments In Joint Venture [Line Items] |  |  |  |  |
Estimated fair value of developed technology acquired |  | $ 9,880,000 |  |  |
Expected useful life of intangible asset |  | 21 years |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |
Schedule Of Investments In Joint Venture [Line Items] |  |  |  |  |
Contingent consideration assumed in asset acquisition |  |  | 3,660,000 |  |
Fair value of financial liabilities measured at fair value on a recurring basis |  |  | 2,081,000 |  |
Shares issued as payment for contingent consideration |  |  | 1,583,000 |  |
Significant Unobservable Inputs (Level 3) | EnviroFlight, LLC |  |  |  |  |
Schedule Of Investments In Joint Venture [Line Items] |  |  |  |  |
Fair value of financial liabilities measured at fair value on a recurring basis |  |  | 2,081,000 |  |
Investments in affiliates | EnviroFlight, LLC |  |  |  |  |
Schedule Of Investments In Joint Venture [Line Items] |  |  |  |  |
Investment |  |  | $ 4,189,000 |  |

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