Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Income Taxes [Line Items]
Income tax expense (benefit)	$ (215,000)	$ 468,000	$ (636,000)	$ 510,000
Net tax shortfall (excess tax benefit) booked to income tax provision, amount	0	$ 900,000	100,000	$ 1,900,000
Accumulated deficit	$ (752,313,000)		$ (752,313,000)		$ (671,885,000)
Revenue Commissioners, Ireland
Income Taxes [Line Items]
Effective income tax rate, percent			12.50%
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Potential withholding tax rate			5.00%
ASC-842
Income Taxes [Line Items]
Cumulative effect of new accounting pronouncement						$ (1,000,000.0)
Accumulated deficit						$ 3,800,000