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Stock Options - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 18, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock, reserved for future issuance | 2,021,543 | 1,987,682 |  |
Weighted average grant-date fair value of options granted | $ 3.97 | $ 6.02 | $ 1.23 |
Stock options vested aggregate intrinsic value | $ 2,485,258 | $ 3,596,624 | $ 7,770,086 |
Stock options expected to vest aggregate intrinsic value | $ 993,372 | $ 1,469,154 | $ 4,569,243 |
Total grant date fair value of shares vested | 2,770,008 | 322,804 | 176,597 |
Restricted Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans | $ 2,781,062 | $ 2,453,342 | $ 522,818 |
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans, period for recognition | 3 years |  |  |
Restricted Stock | Chief Financial Officer And Chief Operating Officer |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Restricted common stock granted |  |  | 57,475 |
Fair value of common stock granted, per share |  |  | $ 2.00 |
Vested percentage of common stock |  | 100.00% |  |
Restricted Stock Units [Member] | Board of Directors |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Restricted common stock granted | 3,962 |  |  |
Fair value of common stock granted, per share | $ 12.62 |  |  |
Restricted stock units, vesting period description | shares vest equally on each of the anniversaries over a three-year period. |  |  |
Restricted stock units, vesting period | 3 years |  |  |
Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Service period for stock options granted to employees | 1 year |  |  |
Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Service period for stock options granted to employees | 4 years |  |  |
Authorized for Grants under the 2016 Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock, reserved for future issuance | 463,491 | 633,052 |  |
Rolled from 2013 Equity Incentive Plan to 2016 Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock, reserved for future issuance | 0 |  |  |
Authorized for Grants under the 2013 Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock, reserved for future issuance | 0 | 0 |  |
Common stock authorized under equity incentive plan |  |  |  | 1,200,000
Vested options cancellation days, after termination of employee |  |  | 90 days |

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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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