Net Loss Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share Basic net loss per share is computed by dividing net loss attributable to ION by the weighted average number of common shares outstanding during the period. In computing diluted net loss per share, basic net loss per share is adjusted based on the assumption that dilutive restricted stock and restricted stock unit awards have vested and outstanding dilutive stock options have been exercised and the aggregate proceeds were used to reacquire common stock using the average price of such common stock for the period. The total number of shares issuable pursuant to outstanding stock options at September 30, 2020 and 2019 of 569,673 and 700,759, respectively, were excluded as their inclusion would have an anti-dilutive effect. The total number of shares issuable pursuant to restricted stock unit awards outstanding at September 30, 2020 and 2019 of 762,277 and 926,917, respectively, were excluded as their inclusion would have an anti-dilutive effect.