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Revenue Arrangements (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Changes in Contract Liabilities
The following table presents changes in the Company’s contract liabilities during the year ended December 31, 2019 (in thousands):
 
 
Balance at
 
 
 
 
 
Balance at
 
 
beginning of period
 
Additions
 
Deductions
 
end of period
Year Ended December 31, 2019
 
 
 
 
 
 
 
 
Contract liabilities:
 
 
 
 
 
 
 
 
     Deferred revenue
 
$
14,777

 
$
8,254

 
$
(6,677
)
 
$
16,354

     Other liabilities (1)
 
2,126

 
—

 
(2,126
)
 
—

Total contract liabilities
 
$
16,903

 
$
8,254

 
$
(8,803
)
 
$
16,354

(1) On June 5, 2019, the term of the Reimbursement Period under the Letter Agreement expired. During the year ended December 31, 2019, the Company updated its estimate of variable consideration included in the transaction price to include $1.2 million of unpaid reimbursements to Spark.