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Stockholders' Equity (Summary Of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Additional shares reserved, Shares available for grant | 4,634 |
$1.16 – 16.00 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Balances, December 31, 2016, Shares available for grant | 6,835 |
Balances, March 31, 2017, Shares available for grant |  | 6,835
Balances, December 31, 2016, Number of shares | 22,501 |
Balances, March 31, 2017, Number of shares |  | 22,501
Exercise price, lower range |  | $ 1.16
Exercise price, upper range |  | 16.00
Balances, December 31, 2015, Weighted average exercise price per share | $ 6.30 |
Balances, December 31, 2016, Weighted average exercise price per share |  | $ 6.30
$4.78 – 5.27 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Options granted, Shares available for grant | (4,708) |
Options granted, Number of shares | 4,708 |
Exercise price, lower range | $ 4.78 |
Exercise price, upper range | 5.27 |
Options granted, Weighted average exercise price per share | $ 5.26 |
$1.16 – 4.55 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Options exercised, Shares available for grant |  |
Options exercised, Number of shares | (114) |
Exercise price, lower range | $ 1.16 |
Exercise price, upper range | 4.55 |
Options exercised, Weighted average exercise price per share | $ 2.70 |
$1.16 – 11.64 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Options canceled, Shares available for grant | 439 |
Options canceled, Number of shares | (439) |
Exercise price, lower range | $ 1.16 |
Exercise price, upper range | 11.64 |
Options canceled, Weighted average exercise price per share | $ 7.34 |
$1.16 – 16.00 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Balances, March 31, 2017, Shares available for grant | 7,200 |
Balances, March 31, 2017, Number of shares | 26,656 |
Exercise price, lower range | $ 1.16 |
Exercise price, upper range | 16.00 |
Balances, December 31, 2016, Weighted average exercise price per share | $ 6.11 |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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