| Accrued expenses and other current liabilities (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2019 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued expenses and other current liabilities | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of accrued expenses and other current liabilities | Accrued expenses and other current liabilities consisted of the following (in thousands): 
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| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Tabular disclosure of the components of accrued liabilities. No definition available. 
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