Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Revenue From Contract With Customer [Abstract]

Schedule of Deferred Revenue by Revenue Classification

Deferred revenue by revenue classification as of December 31, 2021 and 2020 was as follows (in thousands):

	December 31,
	2021		2020
Current deferred revenue
Sequencing	$	21,915	$	15,463
Development		58,545		57,856
Total current deferred revenue		80,460		73,319
Non-current deferred revenue
Sequencing		174		724
Development		98,576		162,894
Total non-current deferred revenue		98,750		163,618
Total current and non-current deferred revenue	$	179,210	$	236,937

Schedule of Changes in Deferred Revenue

Changes in deferred revenue during the year ended December 31, 2021 were as follows (in thousands):

Deferred revenue balance at December 31, 2020	$	236,937
Additions to deferred revenue during the period		38,062
Revenue recognized during the period		(95,789	)
Deferred revenue balance at December 31, 2021	$	179,210