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STOCK AWARD PLAN AND STOCK-BASED COMPENSATION - Stock Option Activity for Employees and Non-Employees (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Shares Issuable Pursuant to Stock Options
Granted (in shares)	0	0
Employees and Non-Employees Stock Option
Shares Issuable Pursuant to Stock Options
Outstanding at the beginning of period (in shares)	9,040,328
Exercised (in shares)	(135,013)
Forfeited (in shares)	(105,356)
Outstanding at the end of the period (in shares)	8,799,959		9,040,328
Exercisable at the end of the period (in shares)	5,614,559
Available for future grant (in shares)	245,354
Weighted-Average Exercise Price
Outstanding at the beginning of period (in dollars per share)	$ 6.98
Exercised (in dollars per share)	5.91
Forfeited (in dollars per share)	9.63
Outstanding at the end of the period (in dollars per share)	6.96		$ 6.98
Exercisable at the end of the period (in dollars per share)	$ 6.69
Weighted-Average Remaining Contractual Term Outstanding (Years)	7 years 1 month 6 days		7 years 3 months 18 days
Weighted-Average Remaining Contractual Term Exercisable (Years)	6 years 4 months 24 days
Total Intrinsic Value Outstanding at the begining of period	$ 7,420
Total Intrinsic Value Outstanding at the end of period	1,625		$ 7,420
Total Intrinsic Value Exercisable	$ 1,586

X

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Number of share options (or share units) exercised during the current period.

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