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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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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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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.

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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.

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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.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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).

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Percentage of vesting of share-based compensation awards.

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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.

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Weighted average grant-date fair value of non-vested options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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