Revenue Recognition (Additional Information) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained deficit		$ (522,476)		$ (524,009)
Revenue	[1]	39,472	$ 19,650
Long-term accounts receivable				$ 700
Deferred revenue		6,300
Decrease in deferred revenue		$ 3,900
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained deficit					$ 1,000

[1] Quarters ended March 31, Components of Revenue2019 2018License Fees3,541 7,414Service Revenue35,931 12,236Net Revenue39,472 19,650 Three Months Ended March 31, Components of Revenue2019 2018License Fees$3,541 $7,414Service Revenue35,931 12,236Net Revenue$39,472 $19,650