Patents (Details) - USD ($)
|
3 Months Ended |
12 Months Ended |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Patents [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Patents, net |
$ 86,319,000
|
|
|
|
$ 162,642,000
|
|
|
|
$ 86,319,000
|
$ 162,642,000
|
|
| Patents, weighted average useful life |
|
|
|
|
|
|
|
|
5 years
|
|
|
| Payments to acquire intangible assets |
|
|
|
|
|
|
|
|
$ 1,225,000
|
19,504,000
|
$ 42,746,000
|
| Accrued patent acquisition related payments |
|
|
|
|
1,000,000
|
|
|
|
|
1,000,000
|
16,700,000
|
| Accelerated amortization expense |
|
|
|
|
|
|
|
|
225,000
|
0
|
1,247,000
|
| Accelerated amortization expense (termination) |
|
|
|
|
|
|
|
|
0
|
380,000
|
2,702,000
|
| Impairment of Patent-Related Intangible Assets |
2,175,000
|
$ 0
|
$ 40,165,000
|
$ 0
|
74,731,000
|
$ 0
|
$ 0
|
$ 0
|
$ 42,340,000
|
74,731,000
|
$ 3,497,000
|
| Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
| Patents [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Patents, useful life |
|
|
|
|
|
|
|
|
1 year
|
|
|
| Acquired Finite Lived Intangible Asset, Useful Life |
|
|
|
|
|
|
|
|
2 years
|
|
|
| Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
| Patents [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Patents, useful life |
|
|
|
|
|
|
|
|
10 years
|
|
|
| Acquired Finite Lived Intangible Asset, Useful Life |
|
|
|
|
|
|
|
|
10 years
|
|
|
| Patents [Member] |
|
|
|
|
|
|
|
|
|
|
|
| Patents [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Gross carrying amount - patents |
444,362,000
|
|
|
|
444,137,000
|
|
|
|
$ 444,362,000
|
444,137,000
|
|
| Accumulated amortization - patents |
358,043,000
|
|
|
|
281,495,000
|
|
|
|
358,043,000
|
281,495,000
|
|
| Patents, net |
$ 86,319,000
|
|
|
|
$ 162,642,000
|
|
|
|
$ 86,319,000
|
$ 162,642,000
|
|
| Patents [Member] | Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
| Patents [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Patents, useful life |
|
|
|
|
|
|
|
|
1 year
|
|
|
| Patents [Member] | Maximum [Member] |
|
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|
|
|
|
|
|
|
|
| Patents [Line Items] |
|
|
|
|
|
|
|
|
|
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| Patents, useful life |
|
|
|
|
|
|
|
|
7 years
|
|
|