Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Instruments Excluded from Calculation of Diluted Net Loss Per Share

The following instruments (in thousands) were excluded from the calculation of diluted net loss per share because their effects would be antidilutive:

	Three months ended June 30,		Six months ended June 30,
	2020	2019	2020	2019
Stock-based awards	21,061	16,791	21,061	16,791
Healios warrant – see Note 6	—	4,000	—	4,000
Total	21,061	20,791	21,061	20,791