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Deferred Revenue (Tables)
12 Months Ended
Dec. 31, 2020
Revenue From Contract With Customer [Abstract]  
Schedule of Deferred Revenue by Revenue Classification

Deferred revenue by revenue classification as of December 31, 2020 and 2019 was as follows (in thousands):

 

 

 

December 31,

 

 

 

2020

 

 

2019

 

Current deferred revenue

 

 

 

 

 

 

 

 

Sequencing

 

$

15,463

 

 

$

12,482

 

Development

 

 

57,856

 

 

 

48,512

 

Total current deferred revenue

 

 

73,319

 

 

 

60,994

 

Non-current deferred revenue

 

 

 

 

 

 

 

 

Sequencing

 

 

724

 

 

 

1,459

 

Development

 

 

162,894

 

 

 

217,873

 

Total non-current deferred revenue

 

 

163,618

 

 

 

219,332

 

Total current and non-current deferred revenue

 

$

236,937

 

 

$

280,326

 

Schedule of Changes in Deferred Revenue

Changes in deferred revenue during the year ended December 31, 2020 were as follows (in thousands):

 

Deferred revenue balance at December 31, 2019

 

$

280,326

 

Additions to deferred revenue during the period

 

 

26,434

 

Revenue recognized during the period

 

 

(69,823

)

Deferred revenue balance at December 31, 2020

 

$

236,937