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Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Parenthetical) (Details) - shares | Jan. 01, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Class Of Stock [Line Items] |  |  |
Treasury stock, shares at cost |  | 371,664 | 357,314
2016 Equity Incentive Plan |  |  |
Class Of Stock [Line Items] |  |  |
Number of authorized shares increased | 384,045 |  |
2016 Employee Stock Purchase Plan |  |  |
Class Of Stock [Line Items] |  |  |
Number of authorized shares increased | 96,011 |  |

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- Definition Number of previously issued common shares repurchased by the issuing entity and held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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