Collaborations and License Agreements (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Summary of Revenue Disaggregated by Major Customers, Timing of Revenue Recognition and Revenue Classification

In the following table, revenue is disaggregated by major customers and timing of revenue recognition, in thousands:

	Year Ended December 31,
Customers	2021		2020
Eisai	$	—	$	262
Other	54		57
Total	$	54	$	319
	Year Ended December 31,
Timing of revenue recognition	2021		2020
Revenue recognized over time	$	—	$	262
Revenue recognized at a point in time	54		57
Total	$	54	$	319