Net loss per common share - Anti-dilutive securities (Details) - shares shares in Thousands |
12 Months Ended | |
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Dec. 31, 2018 |
Dec. 31, 2017 |
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| Earnings per share [line items] | ||
| Anti-dilutive securities | 3,987 | 4,269 |
| Stock options | ||
| Earnings per share [line items] | ||
| Anti-dilutive securities | 1,567 | 1,222 |
| Warrants (derivative liabilities) | ||
| Earnings per share [line items] | ||
| Anti-dilutive securities | 2,420 | 2,415 |
| Warrants (equity) | ||
| Earnings per share [line items] | ||
| Anti-dilutive securities | 0 | 632 |
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- Definition AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareAmount1 No definition available.
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. No definition available.
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