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Stockholders' Equity - Incentive Plans (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
2003 Stock Incentive Plan |  |  |  |
Incentive plans |  |  |  |
Period from date of termination that any vested options shall expire |  | 60 days |  |
Expiration period |  | 10 years |  |
Unrecognized compensation expense related to unvested options |  | $ 1,382 |  |
Intrinsic value of options exercised |  | 97,707 | $ 667,258 | $ 629,232
Cash proceeds from exercise of stock options |  | $ 44,771 | $ 114,124 | $ 133,957
Options exercised |  | 28,368 | 99,029 | 114,836
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 28,368 | 99,029 | 114,836
Fair value of shares vested |  | $ 16,024 | $ 50,310 | $ 63,865
2003 Stock Incentive Plan | Upon first anniversary of start date |  |  |  |
Incentive plans |  |  |  |
Percent of shares subject to option grant that will vest |  | 25.00% |  |
2003 Stock Incentive Plan | Each month after the first anniversary |  |  |  |
Incentive plans |  |  |  |
Percent of shares subject to option grant that will vest |  | 2.083% |  |
2013 Equity Incentive Plan |  |  |  |
Incentive plans |  |  |  |
Period from date of termination that any vested options shall expire |  | 90 days |  |
Expiration period |  | 10 years |  |
Unrecognized compensation expense related to unvested options |  | $ 4,308,701 |  |
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  | 2 years |  |
Shares vested |  |  |  | 0
Intrinsic value of options exercised |  | $ 2,275 |  |
Cash proceeds from exercise of stock options |  | $ 27,825 |  |
Options exercised |  | 3,500 | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 3,500 | 0 | 0
Fair value of shares vested |  | $ 3,053,086 | $ 2,668,712 |
2013 Equity Incentive Plan | Upon first anniversary of start date |  |  |  |
Incentive plans |  |  |  |
Percent of shares subject to option grant that will vest |  | 25.00% |  |
2013 Equity Incentive Plan | Each month after the first anniversary |  |  |  |
Incentive plans |  |  |  |
Percent of shares subject to option grant that will vest |  | 2.083% |  |
Common Stock |  |  |  |
Incentive plans |  |  |  |
Options exercised |  |  | 110,366 | 157,886
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 110,366 | 157,886
Common Stock | 2013 Equity Incentive Plan |  |  |  |
Authorized shares |  |  |  |
Common stock authorized under 2013 plan | 2,837,201 |  |  |
Automatic increase in number of shares reserved for issuance as a percentage of the total common stock outstanding at the end of the prior year | 3.00% | 3.00% |  |
Maximum number of shares that may be issued pursuant to exercise of incentive stock |  | 20,000,000 |  |
Increase in number of shares of common stock | 697,500 |  |  |
Common Stock | 2013 Equity Incentive Plan | Maximum |  |  |  |
Authorized shares |  |  |  |
Common stock authorized under 2013 plan |  | 1,000,000 |  |

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- Definition Period from date of termination of employment by reasons other than death, cause, or disability that any vested options shall expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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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