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Stock-Based Compensation - Summary of Option Activities (Details) - Stock options - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Range of Exercise Prices |  |
Options Outstanding (in shares) | 2,587 | 6,303
Weighted Average Exercise Price (in dollars per share) | $ 1.41 | $ 1.26
Options Exercisable (in shares) | 2,433 | 5,649
Weighted Average Exercise Price (in dollars per share) | $ 1.28 | $ 1.01
Weighted Average Remaining Contractual Life (in years) | 1 year 7 months 6 days | 2 years 2 months 12 days
$0.36 - 0.41 |  |
Range of Exercise Prices |  |
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) | $ 0.36 | $ 0.36
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) | $ 0.41 | $ 0.41
Options Outstanding (in shares) | 1,639 | 4,167
Weighted Average Exercise Price (in dollars per share) | $ 0.36 | $ 0.36
Options Exercisable (in shares) | 1,639 | 4,167
Weighted Average Exercise Price (in dollars per share) | $ 0.36 | $ 0.36
Weighted Average Remaining Contractual Life (in years) | 8 months 12 days | 1 year 8 months 12 days
$0.96 - 1.80 |  |
Range of Exercise Prices |  |
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) | $ 0.96 | $ 0.96
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) | $ 1.80 | $ 1.80
Options Outstanding (in shares) | 79 | 406
Weighted Average Exercise Price (in dollars per share) | $ 0.97 | $ 1.24
Options Exercisable (in shares) | 79 | 406
Weighted Average Exercise Price (in dollars per share) | $ 0.97 | $ 1.24
Weighted Average Remaining Contractual Life (in years) | 1 year 2 months 12 days | 2 years 3 months 18 days
$3.25 - $3.36 |  |
Range of Exercise Prices |  |
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) | $ 3.25 | $ 3.25
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) | $ 3.36 | $ 3.36
Options Outstanding (in shares) | 341 | 682
Weighted Average Exercise Price (in dollars per share) | $ 3.33 | $ 3.32
Options Exercisable (in shares) | 338 | 519
Weighted Average Exercise Price (in dollars per share) | $ 3.33 | $ 3.33
Weighted Average Remaining Contractual Life (in years) | 2 years 6 months | 3 years 6 months
$3.43 - $3.50 |  |
Range of Exercise Prices |  |
Exercise prices, outstanding stock option awards, low end of range (in dollars per share) | $ 3.43 | $ 3.43
Exercise prices, outstanding stock option awards, high end of range (in dollars per share) | $ 3.50 | $ 3.50
Options Outstanding (in shares) | 528 | 1,048
Weighted Average Exercise Price (in dollars per share) | $ 3.48 | $ 3.48
Options Exercisable (in shares) | 377 | 557
Weighted Average Exercise Price (in dollars per share) | $ 3.48 | $ 3.48
Weighted Average Remaining Contractual Life (in years) | 3 years 8 months 12 days | 4 years 7 months 6 days

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- Definition 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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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