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Stockholders' Equity - Employee Stock Purchase Plan (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 27, 2018 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares available for grant (in shares) |  | 1,800,000
ESPP | Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Purchase price of common stock, percent | 85.00% |
Maximum purchase value during offering period, per employee | $ 15 |
ESPP | Employee Stock Purchase Plan | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of purchase value during offering period, per employee | 0.00% |
ESPP | Employee Stock Purchase Plan | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of purchase value during offering period, per employee | 10.00% |
ESPP | Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining number of shares authorized to be repurchase (in shares) |  | 432,000
Share-based compensation expense |  | $ 200
Discount from market price, offering date |  | 15.00%
Number of shares issued to employees (in shares) |  | 68,000
ESPP | Common Stock | Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares available for grant (in shares) | 500,000 |

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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Percentage of Purchase Value During Offering Period, Per Employee + References No definition available. + Details
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- Definition Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans). + References No definition available. + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://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=116856206&loc=d3e5070-113901 + Details
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