|
Litigation and Legal Proceedings (Details) (USD $)
|
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2014
|
Dec. 31, 2014
|
| China, Yuan Renminbi | Huawei [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
$ 20,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_CNY
/ us-gaap_MajorCustomersAxis
= idcc_HuaweiDomain |
|
| China, Yuan Renminbi | ZTE [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
|
20,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_CNY
/ us-gaap_MajorCustomersAxis
= idcc_ZTEDomain |
| China, Yuan Renminbi | Arima China [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
|
120,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_CNY
/ us-gaap_MajorCustomersAxis
= idcc_ArimaChinaDomain |
| United States of America, Dollars | Huawei [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
3,200,000.000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_MajorCustomersAxis
= idcc_HuaweiDomain |
|
| United States of America, Dollars | ZTE [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
|
3,300,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_MajorCustomersAxis
= idcc_ZTEDomain |
| United States of America, Dollars | Arima [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
|
3,150,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_MajorCustomersAxis
= idcc_ArimaDomain |
| United States of America, Dollars | Arima China [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
|
19,500,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_MajorCustomersAxis
= idcc_ArimaChinaDomain |
| Taiwan, New Dollars | Arima [Domain] |
|
|
| Loss Contingencies [Line Items] |
|
|
| Loss Contingency, Damages Sought, Value |
|
$ 100,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_CurrencyAxis
= currency_TWD
/ us-gaap_MajorCustomersAxis
= idcc_ArimaDomain |