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Stock Plan (Details) | 12 Months Ended
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Dec. 31, 2019 shares
Stock Plan [Abstract] |
Vesting period | 4 years
2013 Plan [Member] |
Stock Plan [Abstract] |
Shares available for grant (in shares) | 1,208,070
2013 Plan [Member] | Stock Options [Member] |
Stock Plan [Abstract] |
Vesting period | 4 years
Term of award | 10 years
2013 Plan [Member] | Stock Options [Member] | Named Executive Officers [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 100.00%
2013 Plan [Member] | Stock Options [Member] | 10% Shareholder [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 110.00%
2013 Plan [Member] | Incentive Stock Options [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 100.00%
2013 Plan [Member] | Nonqualified Stock Options [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 85.00%
2013 Plan [Member] | Restricted Stock Purchase Rights ("RSU") [Member] |
Stock Plan [Abstract] |
Vesting period | 4 years

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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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