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Weichai Transactions - Weichai Warrant (Details) - USD ($) |  |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 03, 2019 | Apr. 23, 2019 | Apr. 01, 2019 | Oct. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2016
Share Purchase Agreement, Weichai Transaction |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
EBITDA, minimum |  |  |  |  |  |  | $ 22,000,000
Net book value per share, minimum (in dollars per share) |  |  |  |  |  |  | $ 8
Aggregate amount |  |  |  |  |  |  | $ 15,000,000
Share Purchase Agreement, Weichai Transaction | Subsequent Event |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Volume weighted average share price percentage |  |  |  |  | 50.00% | 85.00% |
Trading period |  |  |  |  |  | 20 days |
Exercisable (term) |  |  |  |  |  | 90 days |
Share Purchase Agreement, Second Amended And Restated Warrant | Subsequent Event |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Volume weighted average share price percentage |  |  |  | 50.00% | 50.00% |  |
Trading period |  |  |  | 20 days | 20 days |  |
Exercisable (term) |  |  |  |  | 90 days |  |
Share Purchase Agreement, Second Amended And Restated Warrant | Subsequent Event | Maximum |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Reduction of exercise price |  |  |  | $ 15,000,000 |  |  |
Series B | Share Purchase Agreement, Second Amended And Restated Warrant | Subsequent Event |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Percent ownership of outstanding common stock | 51.50% |  | 51.00% |  |  |  |
Exercise proceeds for the warrants |  | $ 1,600,000 |  |  |  |  |
Exercise of private placement warrants (in shares) |  | 4,049,759 |  |  |  |  |

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- Definition Class Of Warrant Or Right, Covenant, Earnings Before Interest, Tax, Depreciation And Amortization, Minimum + References No definition available. + Details
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- Definition Class Of Warrant Or Right, Covenant, Net Book Value Per Share, Minimum + References No definition available. + Details
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- Definition Class Of Warrant Or Right, Volume Weighted Average Share Price Percentage + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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