Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Revenue From Contract With Customer [Abstract]

Schedule of Deferred Revenue by Revenue Classification

Deferred revenue by revenue classification as of December 31, 2019 and 2018 was as follows (in thousands):

	December 31,
	2019		2018
Current deferred revenue
Sequencing	$	12,482	$	11,238
Development		48,512		1,457
Total current deferred revenue		60,994		12,695
Non-current deferred revenue
Sequencing		1,459		516
Development		217,873		188
Total non-current deferred revenue		219,332		704
Total current and non-current deferred revenue	$	280,326	$	13,399

Schedule of Changes in Deferred Revenue

Changes in deferred revenue during the year ended December 31, 2019 were as follows (in thousands):

Deferred revenue balance at December 31, 2018	$	13,399
Additions to deferred revenue during the period		317,551
Revenue recognized during the period		(50,624	)
Deferred revenue balance at December 31, 2019	$	280,326