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Stock-Based Compensation - Summary of Significant Ranges of Outstanding and Exercisable Options (Details) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Aug. 23, 2016
Options Exercisable |  |
Weighted Average Exercise Price (in dollars per share) |  | $ 7.20
Options |  |
Options Outstanding |  |
Vested and expected to vest, Number Outstanding | 303 |
Exercisable, Number Outstanding | 178 |
Vested and expected to vest, Weighted Average Remaining Contractual Life (in Years) | 5 years 10 months 6 days |
Exercisable, Weighted Average Remaining Contractual Life | 6 years 1 month 9 days |
Vested and expected to vest, Weighted Average Exercise Price | $ 4.52 |
Exercisable, Weighted Average Exercise Price | 6.25 |
Options | $0.75 - $1.27 |  |
Exercise price range |  |
Lower range limit (in dollars per share) | 0.75 |
Upper range limit (in dollars per share) | $ 1.27 |
Options Outstanding |  |
Number Outstanding (in shares) | 159 |
Weighted Average Remaining Contractual Life | 4 years 9 months 18 days |
Weighted Average Exercise Price (in dollars per share) | $ 0.75 |
Options Exercisable |  |
Number Exercisable (in shares) | shares | 53 |
Weighted Average Exercise Price (in dollars per share) | $ 0.75 |
Options | $1.28 - $7.19 |  |
Exercise price range |  |
Lower range limit (in dollars per share) | 1.28 |
Upper range limit (in dollars per share) | $ 7.19 |
Options Outstanding |  |
Number Outstanding (in shares) | 51 |
Weighted Average Remaining Contractual Life | 5 years 4 months 24 days |
Weighted Average Exercise Price (in dollars per share) | $ 2.09 |
Options Exercisable |  |
Number Exercisable (in shares) | shares | 22 |
Weighted Average Exercise Price (in dollars per share) | $ 2.85 |
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) | 108 |
Weighted Average Remaining Contractual Life | 7 years 3 months 14 days |
Weighted Average Exercise Price (in dollars per share) | $ 7.20 |
Options Exercisable |  |
Number Exercisable (in shares) | shares | 84 |
Weighted Average Exercise Price (in dollars per share) | $ 7.20 |
Options | $20.50 - $46.20 |  |
Exercise price range |  |
Lower range limit (in dollars per share) | 20.50 |
Upper range limit (in dollars per share) | $ 46.20 |
Options Outstanding |  |
Number Outstanding (in shares) | 19 |
Weighted Average Remaining Contractual Life | 6 years 2 months 8 days |
Weighted Average Exercise Price (in dollars per share) | $ 21.53 |
Options Exercisable |  |
Number Exercisable (in shares) | shares | 19 |
Weighted Average Exercise Price (in dollars per share) | $ 21.55 |
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) | 337 |
Weighted Average Remaining Contractual Life | 5 years 9 months 7 days |
Weighted Average Exercise Price (in dollars per share) | $ 4.19 |
Options Exercisable |  |
Number Exercisable (in shares) | shares | 178 |
Weighted Average Exercise Price (in dollars per share) | $ 6.25 |

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- Definition Share based compensation shares authorized under stock option plans exercise price range options outstanding. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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