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Stockholders' Equity - Incentive Plans (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
2003 Stock Incentive Plan |  |  |  |
Incentive plans |  |  |  |
Period from date of termination that any vested options shall expire |  | 60 days |  |
Expiration period |  | 10 years |  |
Intrinsic value of options exercised |  | $ 716,920 | $ 103,638 | $ 97,707
Cash proceeds from exercise of stock options |  | $ 59,659 | $ 27,357 | $ 44,771
Options exercised |  | 46,131 | 16,608 | 28,368
Fair value of shares vested |  |  | $ 1,573 | $ 16,024
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 |  | $ 9,129,271 |  |
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  | 2 years 8 months 12 days |  |
Intrinsic value of options exercised |  | $ 1,344,026 | 385,701 | 2,275
Cash proceeds from exercise of stock options |  | $ 962,530 | $ 346,019 | $ 27,825
Options exercised |  | 144,182 | 54,521 | 3,500
Fair value of shares vested |  | $ 3,003,632 | $ 3,506,568 | $ 3,053,086
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 |  |  | 71,129 |
Common Stock | 2013 Equity Incentive Plan |  |  |  |
Authorized shares |  |  |  |
Common stock authorized under 2013 plan | 5,162,816 |  |  |
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 | 1,294,822 |  |  |
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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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