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Revenue recognition (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |
Contract liabilities, rollforward and revenue recognition | During the three month periods ended March 31, 2019 and 2018, the Company recognized revenue in the period from:
|  | Three Months Ended March 31, 2019 |  | Three Months Ended March 31, 2018
Amounts included in contract liabilities at the beginning of the period |  | $ | — |  |  | $ | — |
Performance obligations satisfied in previous period |  | — |  |  | — |
Performance obligations satisfied in current period |  | 53,054 |  |  | 55,981 |
Total product revenue |  | $ | 53,054 |  |  | $ | 55,981 |
The following table presents changes in the Company’s contract liabilities from December 31, 2018 to March 31, 2019 and December 31, 2017 to March 31, 2018:
|  | Balance as of December 31, 2018 |  | Additions |  | Deductions |  | ASC 606 Adjustment |  | Balance as of March 31, 2019
Deferred Revenue |  | $ | 12,938 |  |  | $ | 1,412 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,350 |
|  | Balance as of December 31, 2017 |  | Additions |  | Deductions |  | ASC 606 Adjustment |  | Balance as of March 31, 2018
Deferred Revenue |  | $ | 11,891 |  |  | $ | 1,346 |  |  | $ | — |  |  | $ | (3,937 | ) |  | $ | 9,300 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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Period Type: | duration

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- References No definition available. + Details
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Period Type: | duration