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Revenue recognition (Tables)
 3 Months Ended
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