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STOCK AWARD PLAN AND STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2017	Mar. 31, 2020	Mar. 31, 2019
Stock Award Plan and Stock-Based Compensation
Shares issued		0	0
Fair value of common stock on grant date (in dollars per share)		$ 5.01
Total intrinsic value of the stock options exercised		$ 0.3	$ 0.2
Dividend yield (as a percent)		0.00%
Employee Stock Option
Stock Award Plan and Stock-Based Compensation
Total unrecognized compensation costs		$ 15.8
Weighted-average period over which unrecognized compensation costs is expected to be recognized		2 years 3 months 14 days
Restricted Stock Units
Stock Award Plan and Stock-Based Compensation
Total unrecognized compensation costs		$ 0.6
Weighted-average period over which unrecognized compensation costs is expected to be recognized		10 months 24 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 | Common Stock
Stock Award Plan and Stock-Based Compensation
Increase in number of shares authorized for issuance		2,500,000
2013 Equity Incentive Plan | Employee Stock Option | Common Stock | Rick Russell
Stock Award Plan and Stock-Based Compensation
Shares issued	775,000
2013 Equity Incentive Plan | Restricted Stock Units | Common Stock | Rick Russell
Stock Award Plan and Stock-Based Compensation
Shares issued	40,000

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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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.

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