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STOCKHOLDERS' EQUITY - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended					12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares	May 31, 2020 shares	Jan. 31, 2020 shares	May 31, 2019 shares	Apr. 30, 2018 USD ($)	Dec. 31, 2020 USD ($) plan $ / shares shares	Dec. 31, 2019 USD ($) $ / shares	Mar. 10, 2020 USD ($) shares	Mar. 09, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of common stock and other securities | $					$ 175,000	$ 111,760
Value of unsold securities on current effective registration statements | $					$ 60,000
Value of additional shares authorized | $								$ 5,000
Shares repurchase authorized (in shares)									364,446
Number of active equity plans | plan						1
Shares available for future grant (in shares)	1,244,000					1,244,000		364,446
Options granted (in shares)						771,000
Share-based compensation | $						$ 2,365	$ 2,268
Exercised in period, intrinsic value | $						205	$ 356
Unrecognized compensation costs | $	$ 2,563					$ 2,563
Period of recognition of unrecognized compensation costs (in years)						1 year 9 months
Commitment Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	2,990,000
Public offering price (USD per Share) | $ / shares	$ 7.25					$ 7.25
Sale of stock, consideration received on transaction | $	$ 21,700
The 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant (in shares)	750,000					750,000
Options granted (in shares)						1,713,000
The 2018 Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)						3 years
Award expiration period (in years)						5 years
The 2018 Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)						4 years
Award expiration period (in years)						10 years
2018 Plan Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)		1,000,000		600,000
Offer Exchange Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding (in USD per Share) | $ / shares							$ 8.50
Number of shares underlying an eligible option in exchange for one new RSU (in shares)							2.5
Options purchased (in shares)			467,500
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in exchange (in shares)						597,000
Unrecognized compensation costs | $	$ 2,238					$ 2,238
Period of recognition of unrecognized compensation costs (in years)						2 years 3 months 25 days
Vested in period, fair value | $						$ 528	$ 430
Restricted Stock Units (RSUs) | Offer Exchange Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in exchange (in shares)			187,000

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