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Income Taxes - Tax credit carry forwards (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Apr. 30, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Tax Credit Carryforward [Line Items] |  |  |
Common stock, shares issued | 20,922,428 |  | 1,431,615
Research and development credits | Federal |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Research and development tax credit carryforwards | $ 1.3 |  |
Research and development credits | State |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Research and development tax credit carryforwards | $ 1.7 |  |
IPO |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Common stock, shares issued |  | 5,200,000 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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