Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Contracts with Customer (Details)

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Revenue Recognition - Contracts with Customer (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Contract Assets    
Beginning balance $ 35 $ 0
Additions 12,073 8,934
Deductions (11,081) (8,899)
Ending balance 1,027 35
Unbilled receivables, current    
Beginning balance 1,916 0
Additions 13,014 2,908
Deductions (4,831) (992)
Ending balance 10,099 1,916
Unbilled receivables, non-current    
Beginning balance 786 0
Additions 0 786
Deductions (786) 0
Ending balance 0 786
Contract Costs    
Beginning balance 42 239
Additions 0 0
Deductions (42) (197)
Ending balance 0 42
Contract Liabilities: Deferred Revenue    
Beginning balance 8,288 18,966
Additions 7,552 6,446
Deductions (13,796) (17,124)
Ending balance 2,044 8,288
Change in Contract with Customer, Liability [Abstract]    
Performance obligations satisfied 4,567 13,615
Changes in the estimated transaction price allocated to performance obligations satisfied in prior periods 1,442 374
Performance obligations satisfied from new activities in the period - contract revenue 62,449 46,605
Total revenue $ 68,458 $ 60,594