Liabilities - Restructuring Accruals (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Jun. 30, 2018 employee	Mar. 31, 2018 USD ($)
Restructuring Accruals
Number of employees terminated | employee		40
Restructuring charges	$ 1,430		$ 2,695
Restructuring accruals roll forward
Balance at the beginning of the period	2,213
Provision	1,430
Payments	(1,923)
Balance at the end of the period	1,720
Personnel severance and related costs
Restructuring accruals roll forward
Balance at the beginning of the period	2,143
Provision	1,320
Payments	(1,743)
Balance at the end of the period	1,720
Facility Related Costs and Other
Restructuring accruals roll forward
Balance at the beginning of the period	70
Provision	110
Payments	$ (180)