Summary Of Significant Accounting Policies - Schedule of Impact of Adoption on Condensed Consolidated Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
STATEMENT OF OPERATIONS
Royalty and license fees	$ 63,954	$ 91,322	$ 129,486	$ 158,577
Cost of revenue	2,080	1,303	4,404	2,703
Operating income (loss)	(27,606)	(5,674)	(60,097)	(45,569)
Other income and expense, net	2,229	220	5,383	266
Loss before taxes	(31,577)	(12,500)	(67,232)	(58,808)
Provision for (benefit from) income taxes	(3,321)	26,557	(5,959)	(8,722)
Net loss	$ (28,256)	$ (39,057)	$ (61,273)	$ (50,086)
Basic/Diluted net loss per share:
Basic (in dollars per share)	$ (0.58)	$ (0.79)	$ (1.25)	$ (1.02)
Assets
Unbilled contracts receivable	$ 175,315		$ 175,315			$ 10,866
Other current assets	16,422		16,422		$ 14,949	16,949
Long-term unbilled contracts receivable	65,013		65,013		106,913	2,930
Other assets	4,959		4,959		7,326	9,772
Liabilities
Accrued liabilities	24,254		24,254		48,401	47,969
Deferred revenue	4,106		4,106		1,903	2,686
Long-term deferred tax liabilities	64,545		64,545		79,605	15,085
Equity
Retained earnings	211,722		211,722		292,684	68,556
Calculated under Revenue Guidance in Effect before Topic 606
STATEMENT OF OPERATIONS
Royalty and license fees	96,716		192,876
Cost of revenue	2,230		4,329
Operating income (loss)	5,006		3,368
Other income and expense, net	81		1,084
Loss before taxes	(1,112)		(8,065)
Provision for (benefit from) income taxes	2,458		4,708
Net loss	$ (3,570)		$ (12,773)
Basic/Diluted net loss per share:
Basic (in dollars per share)	$ (0.07)		$ (0.26)
Assets
Unbilled contracts receivable	$ 5,568		$ 5,568
Other current assets	17,922		17,922			16,949
Long-term unbilled contracts receivable	2,091		2,091			2,930
Other assets	6,609		6,609			9,772
Liabilities
Accrued liabilities	25,019		25,019			47,969
Deferred revenue	4,838		4,838			2,686
Long-term deferred tax liabilities	9,225		9,225			15,085
Equity
Retained earnings	36,026		36,026			$ 68,556
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
STATEMENT OF OPERATIONS
Royalty and license fees	(32,762)		(63,390)
Cost of revenue	(150)		75
Operating income (loss)	(32,612)		(63,465)
Other income and expense, net	2,148		4,299
Loss before taxes	(30,465)		(59,167)
Provision for (benefit from) income taxes	(5,779)		(10,667)
Net loss	$ (24,686)		$ (48,500)
Basic/Diluted net loss per share:
Basic (in dollars per share)	$ (0.51)		$ (0.99)
Assets
Unbilled contracts receivable	$ 169,747		$ 169,747
Other current assets	(1,500)		(1,500)		(2,000)
Long-term unbilled contracts receivable	62,922		62,922		103,983
Other assets	(1,650)		(1,650)		(2,446)
Liabilities
Accrued liabilities	(765)		(765)		432
Deferred revenue	(732)		(732)		(783)
Long-term deferred tax liabilities	55,320		55,320		64,520
Equity
Retained earnings	$ 175,696		$ 175,696		$ 224,128