Stock Option And Other Benefit Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of shares, beginning balances	7,164	7,370	10,399
Options granted, number of shares	10,347	1,659	1,344
Options canceled, number of shares	(1,273)	(425)	(1,506)
Options exercised, number of shares	(425)	(1,440)	(2,867)
Number of shares, ending balances	15,813	7,164	7,370
Options vested and expected to vest, number of shares	13,868
Options exercisable, number of shares	4,889
Weighted average exercise price, beginning balances	$ 3.73	$ 3.32	$ 2.98
Options granted, weighted average exercise price	2.16	4.65	4.08
Options canceled, weighted average exercise price	4.04	4.00	3.72
Options exercised, weighted average exercise price	1.55	2.64	2.19
Weighted average exercise price, ending balances	2.74	$ 3.73	$ 3.32
Options vested and expected to vest, weighted average exercise price	2.81
Options exercisable, weighted average exercise price	$ 3.72
Weighted average contractual term, options outstanding	7 years 4 months 17 days
Weighted average contractual term, options vested and expected	7 years 22 days
Weighted average contractual term, Options exercisable	2 years 9 months 7 days
Quoted closing price of Company's common stock	$ 1.94
Cash proceed from option exercise, net	$ 294	$ 3,794	$ 6,271
Income tax benefit from stock option exercises	$ 0	$ 0	$ 0
$2.10 - $2.10
Range of Exercise Prices, Lower Limit	$ 2.10
Range of Exercise Prices, Upper Limit	$ 2.10
Number of shares, ending balances	5,707
Weighted average exercise price, ending balances	$ 2.10
Options exercisable, weighted average exercise price	$ 0.00
Weighted average contractual term, options outstanding	9 years 10 months 13 days
$2.13 - $2.13
Range of Exercise Prices, Lower Limit	$ 2.13
Range of Exercise Prices, Upper Limit	$ 2.13
Number of shares, ending balances	3,450
Weighted average exercise price, ending balances	$ 2.13
Options exercisable, weighted average exercise price	$ 0.00
Weighted average contractual term, options outstanding	9 years 9 months 11 days
$2.14 - $2.90
Range of Exercise Prices, Lower Limit	$ 2.14
Range of Exercise Prices, Upper Limit	$ 2.90
Number of shares, ending balances	1,951
Options exercisable, number of shares	1,474
Weighted average exercise price, ending balances	$ 2.63
Options exercisable, weighted average exercise price	$ 2.74
Weighted average contractual term, options outstanding	3 years 3 months 7 days
$2.91 - $3.29
Range of Exercise Prices, Lower Limit	$ 2.91
Range of Exercise Prices, Upper Limit	$ 3.29
Number of shares, ending balances	2,089
Options exercisable, number of shares	1,452
Weighted average exercise price, ending balances	$ 3.09
Options exercisable, weighted average exercise price	$ 3.14
Weighted average contractual term, options outstanding	4 years 2 months 16 days
$3.56 - $4.30
Range of Exercise Prices, Lower Limit	$ 3.56
Range of Exercise Prices, Upper Limit	$ 4.30
Number of shares, ending balances	1,582
Options exercisable, number of shares	1,002
Weighted average exercise price, ending balances	$ 4.00
Options exercisable, weighted average exercise price	$ 3.95
Weighted average contractual term, options outstanding	4 years 7 months 28 days
$4.35 - $6.67
Range of Exercise Prices, Lower Limit	$ 4.35
Range of Exercise Prices, Upper Limit	$ 6.67
Number of shares, ending balances	966
Options exercisable, number of shares	893
Weighted average exercise price, ending balances	$ 5.40
Options exercisable, weighted average exercise price	$ 5.43
Weighted average contractual term, options outstanding	4 years 2 months 5 days
$9.64 - $9.64
Range of Exercise Prices, Lower Limit	$ 9.64
Range of Exercise Prices, Upper Limit	$ 9.64
Number of shares, ending balances	1
Options exercisable, number of shares	1
Weighted average exercise price, ending balances	$ 9.64
Options exercisable, weighted average exercise price	$ 9.64
Weighted average contractual term, options outstanding	9 months 7 days
$11.50 - $11.50
Range of Exercise Prices, Lower Limit	$ 11.50
Range of Exercise Prices, Upper Limit	$ 11.50
Number of shares, ending balances	65
Options exercisable, number of shares	65
Weighted average exercise price, ending balances	$ 11.50
Options exercisable, weighted average exercise price	$ 11.50
Weighted average contractual term, options outstanding	2 months 19 days
$11.66 - $11.66
Range of Exercise Prices, Lower Limit	$ 11.66
Range of Exercise Prices, Upper Limit	$ 11.66
Number of shares, ending balances	1
Options exercisable, number of shares	1
Weighted average exercise price, ending balances	$ 11.66
Options exercisable, weighted average exercise price	$ 11.66
Weighted average contractual term, options outstanding	6 months 26 days
$11.88 - $11.88
Range of Exercise Prices, Lower Limit	$ 11.88
Range of Exercise Prices, Upper Limit	$ 11.88
Number of shares, ending balances	1
Options exercisable, number of shares	1
Weighted average exercise price, ending balances	$ 11.88
Options exercisable, weighted average exercise price	$ 11.88
Weighted average contractual term, options outstanding	3 months 18 days
$2.10 - $11.88
Range of Exercise Prices, Lower Limit	$ 2.10
Range of Exercise Prices, Upper Limit	$ 11.88
Number of shares, ending balances	15,813
Options exercisable, number of shares	4,889
Weighted average exercise price, ending balances	$ 2.74
Options exercisable, weighted average exercise price	$ 3.72
Weighted average contractual term, options outstanding	7 years 4 months 17 days

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Price of a single share of a number of saleable stocks of a company.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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