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Revenue recognition - (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue from Contract with Customer [Abstract] |
Contract liabilities, rollforward and revenue recognition | During the three and nine month periods ended September 30, 2019 and 2018, the Company recognized revenue in the period from:
|  | Three Months Ended September 30, 2019 |  | Three Months Ended September 30, 2018 |  | Nine Months Ended September 30, 2019 | Nine Months Ended September 30, 2018
Amounts included in contract liabilities at the beginning of the period |  | $ | 2,269 |  |  | $ | — |  |  | $ | 2,269 |  | $ | — |
Performance obligations satisfied in current period |  | 69,100 |  |  | 53,021 |  |  | 207,630 |  | 177,172 |
Total product revenue |  | $ | 71,369 |  |  | $ | 53,021 |  |  | $ | 209,899 |  | $ | 177,172 |
The following table presents changes in the Company’s contract liabilities from December 31, 2018 to September 30, 2019 and December 31, 2017 to September 30, 2018:
|  | Balance as of December 31, 2018 |  | Additions |  | Deductions |  | ASC 606 Adjustment |  | Balance as of September 30, 2019
Deferred Revenue |  | $ | 12,938 |  |  | $ | 3,801 |  |  | $ | (2,433 | ) |  | $ | — |  |  | $ | 14,306 |
|  | Balance as of December 31, 2017 |  | Additions |  | Deductions |  | ASC 606 Adjustment |  | Balance as of September 30, 2018
Deferred Revenue |  | $ | 11,891 |  |  | $ | 4,706 |  |  | $ | — |  |  | $ | (3,937 | ) |  | $ | 12,660 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- References No definition available. + Details
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