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Stock-Based Compensation - Ranges of Outstanding and Exercisable Options (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) $ / shares shares
$20.50 - $43.59 |
Options Outstanding |
Number Outstanding (in shares) | shares | 20
Weighted Average Remaining Contractual Life | 6 years 9 months 29 days
Weighted Average Exercise Price (in dollars per share) | $ 20.89
Options Exercisable |
Number Exercisable (in shares) | shares | 15
Weighted Average Exercise Price (in dollars per share) | $ 21.02
Options |
Options Outstanding |
Vested and expected to vest, Number Outstanding | shares | 281
Vested and expected to vest, Weighted Average Remaining Contractual Life (in Years) | 7 years 1 month 2 days
Vested and expected to vest, Weighted Average Exercise Price | $ 5.07
Exercisable, Number Outstanding | shares | 73
Exercisable, Weighted Average Remaining Contractual Life | 8 years 1 month 24 days
Exercisable, Weighted Average Exercise Price | $ 10.55
Aggregate Intrinsic Value [Abstract] |
Vested and expected to vest, Aggregate Intrinsic Value | $ | $ 50
Options | $0.75 - $2.35 |
Exercise price range |
Lower range limit (in dollars per share) | $ 0.75
Upper range limit (in dollars per share) | $ 2.35
Options Outstanding |
Number Outstanding (in shares) | shares | 160
Weighted Average Remaining Contractual Life | 5 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share) | $ 0.75
Aggregate Intrinsic Value [Abstract] |
Options Outstanding, Aggregate Intrinsic Value | $ | $ 58
Options | $2.36 - $7.19 |
Exercise price range |
Lower range limit (in dollars per share) | $ 2.36
Upper range limit (in dollars per share) | $ 7.19
Options Outstanding |
Number Outstanding (in shares) | shares | 11
Weighted Average Remaining Contractual Life | 8 years 7 months 28 days
Weighted Average Exercise Price (in dollars per share) | $ 4.92
Options Exercisable |
Number Exercisable (in shares) | shares | 6
Weighted Average Exercise Price (in dollars per share) | $ 5.18
Options | $7.20 - $20.49 |
Exercise price range |
Lower range limit (in dollars per share) | 7.20
Upper range limit (in dollars per share) | $ 20.49
Options Outstanding |
Number Outstanding (in shares) | shares | 114
Weighted Average Remaining Contractual Life | 8 years 7 months 21 days
Weighted Average Exercise Price (in dollars per share) | $ 7.20
Options Exercisable |
Number Exercisable (in shares) | shares | 51
Weighted Average Exercise Price (in dollars per share) | $ 7.20
Options | $20.50 - $43.59 |
Exercise price range |
Lower range limit (in dollars per share) | 20.50
Upper range limit (in dollars per share) | 43.59
Options | $44.60 - $46.19 |
Exercise price range |
Lower range limit (in dollars per share) | 44.60
Upper range limit (in dollars per share) | $ 46.19
Options Outstanding |
Number Outstanding (in shares) | shares | 1
Weighted Average Remaining Contractual Life | 2 years 9 months 4 days
Weighted Average Exercise Price (in dollars per share) | $ 44.60
Options Exercisable |
Number Exercisable (in shares) | shares | 1
Weighted Average Exercise Price (in dollars per share) | $ 44.60
Options | $46.20 - $46.20 |
Exercise price range |
Lower range limit (in dollars per share) | 46.20
Upper range limit (in dollars per share) | $ 46.20
Options Outstanding |
Number Outstanding (in shares) | shares | 1
Weighted Average Remaining Contractual Life | 6 years 1 month 17 days
Weighted Average Exercise Price (in dollars per share) | $ 46.20
Options Exercisable |
Weighted Average Exercise Price (in dollars per share) | 46.20
Options | $0.75 - $46.20 |
Exercise price range |
Lower range limit (in dollars per share) | 0.75
Upper range limit (in dollars per share) | $ 46.20
Options Outstanding |
Number Outstanding (in shares) | shares | 307
Weighted Average Remaining Contractual Life | 7 years 7 days
Weighted Average Exercise Price (in dollars per share) | $ 4.81
Options Exercisable |
Number Exercisable (in shares) | shares | 73
Weighted Average Exercise Price (in dollars per share) | $ 10.55
Aggregate Intrinsic Value [Abstract] |
Options Outstanding, Aggregate Intrinsic Value | $ | $ 58

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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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