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Stock Options - Additional Information (Details) - USD ($) |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 18, 2015 | Mar. 18, 2015 | Feb. 28, 2014 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2003
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, reserved for future issuance |  |  |  |  |  |  |  |  | 1,901,140 | 4,947,200 |  |
Weighted average grant-date fair value of options granted |  |  |  |  |  |  |  |  | $ 1.23 | $ 0.84 | $ 1.43 |
Stock options vested aggregate intrinsic value |  |  |  |  |  |  |  |  | $ 7,770,086 |  |  |
Stock options expected to vest aggregate intrinsic value |  |  |  |  |  |  |  |  | $ 4,569,243 |  |  |
Total grant date fair value of shares vested |  |  |  |  |  |  |  |  | 176,597 | 345,174 | 621,709 |
Stock-based compensation |  |  |  |  |  |  |  |  | $ 298,535 | $ 341,554 | $ 657,730 |
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 |  |  |  |  |  |  |  |  | $ 522,818 | $ 214,304 |  |
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans, period for recognition |  |  |  |  |  |  |  |  | 3 years |  |  |
Restricted Stock | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted common stock granted |  |  |  |  |  |  |  |  |  | 50,000 | 260,924 |
Fair value of common stock granted, per share |  |  |  |  |  |  |  |  |  |  | $ 2.20 |
Vested percentage of common stock |  |  | 68.75% | 6.25% | 6.25% | 6.25% | 6.25% | 6.25% |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  | $ 0 |  |  |
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% |  |  |
Vested period of restricted common stock |  |  |  |  |  |  |  |  | 6 months |  |  |
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 |  |  |  |  |  |  |  |  | 709,750 |  |  |
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 |  |  |  |  |  |  |  |  | 429,750 |  |  |
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 | 321,313 |  |
Increase in share reserved for issuance | 300,000 | 300,000 |  |  |  |  |  |  |  |  |  |
Common stock authorized under equity incentive plan | 1,200,000 |  |  |  |  |  |  |  |  |  |  |
Vested options cancellation days, after termination of employee |  |  |  |  |  |  |  |  | 90 days |  |  |
2003 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, reserved for future issuance |  |  |  |  |  |  |  |  | 0 |  |  |
Common stock authorized under equity incentive plan |  |  |  |  |  |  |  |  |  |  |  | 600,000

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + 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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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