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STOCK OPTION PLAN AND STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 02, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Jan. 01, 2017
Stock Option Plan and Stock-Based Compensation |  |  |  |  |
Fair value of common stock on grant date (in dollars per share) |  | $ 5.20 |  |  |
Weighted average contractual term of the options outstanding |  | 7 years 9 months 19 days |  |  |
Intrinsic value of outstanding stock options (in dollars) |  | $ 6,600,000 |  |  |
Stock options granted |  | 435,000 |  |  |
Stock-based compensation expense |  | $ 3,800,000 | $ 2,600,000 |  |
Dividend yield (as a percent) |  | 0.00% | 0.00% |  |
Employee Stock Option |  |  |  |  |
Stock Option Plan and Stock-Based Compensation |  |  |  |  |
Total unrecognized compensation costs |  | $ 8,000,000 |  |  |
Weighted-average period over which unrecognized compensation costs is expected to be recognized |  | 2 years 7 months 7 days |  |  |
Non-Employees Stock Options |  |  |  |  |
Stock Option Plan and Stock-Based Compensation |  |  |  |  |
Stock options granted |  | 155,000 |  |  |
Stock-based compensation expense |  | $ 200,000 | $ 15,000 |  |
Dividend yield (as a percent) |  | 0.00% | 0.00% |  |
RSUs |  |  |  |  |
Stock Option Plan and Stock-Based Compensation |  |  |  |  |
Total unrecognized compensation costs |  | $ 2,100,000 |  |  |
Weighted-average period over which unrecognized compensation costs is expected to be recognized |  | 3 years 2 months 13 days |  |  |
Vesting rights percentage |  | 25.00% |  |  |
Vesting period |  | 4 years |  |  |
Description of vesting rights |  | RSUs awarded to employees generally vest one-fourth per year over four years from the anniversary of the date of grant |  |  |
2013 Equity Incentive Plan |  |  |  |  |
Stock Option Plan and Stock-Based Compensation |  |  |  |  |
Increase in number of shares authorized for issuance |  |  |  | 750,000 |
Shares authorized for issuance under the plan |  |  |  |  | 5,781,333
Additional shares authorized for issuance under the plan as percentage of total shares outstanding |  | 4.00% |  |  |
Maximum | 2013 Equity Incentive Plan | Employee Stock Option |  |  |  |  |
Stock Option Plan and Stock-Based Compensation |  |  |  |  |
Term of share-based award | 10 years |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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://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=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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