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Stock Plan and Stock-Based Compensation - Summary of Non-Vested Restricted Stock (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Remaining Contractual Term (Years) | 8 years 9 months 29 days |
Non-vested Restricted Stock |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Beginning balance, Number of Shares | 289,352 |
Vested during the year, Number of Shares | 289,352 |
Ending balance, Number of Shares |  | 289,352
Beginning balance, Weighted Average Grant Date Fair Value | $ 0.000396 |
Vested during the year, Weighted Average Grant Date Fair Value | $ 0.000396 |
Ending balance, Weighted Average Grant Date Fair Value |  | $ 0.000396
Remaining Contractual Term (Years) |  | 4 months 24 days

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- Definition Weighted average remaining contractual term for option awards outstanding, 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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