STOCKHOLDERS EQUITY - Summary Information about Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Roll Forward]
Beginning balance (in shares)	515	418
Granted (in shares)	0	104
Exercised (in shares)	0	0
Forfeited or Expired (in shares)	(79)	(7)
Ending balance (in shares)	436	515	418
Exercisable (in shares)	274
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in dollars per share)	$ 2.96	$ 3.42
Weighted average exercise price, granted (in dollars per share)	0	1.89
Weighted average exercise price, exercised (in dollars per share)	0	0
Weighted average exercise price, forfeited or expired (in dollars per share)	3.75	12.01
Weighted average exercise price, ending balance (in dollars per share)	2.81	$ 2.96	$ 3.42
Weighted average exercise price, exercisable (in dollars per share)	$ 3.23
Weighted-average remaining contractual term, outstanding	6 years 8 months 26 days	7 years 2 months 26 days	7 years 8 months 1 day
Weighted-average remaining contractual term, exercisable	5 years 1 month 13 days
Aggregate intrinsic value outstanding	$ 424	$ 60	$ 9
Aggregate intrinsic value exercisable	$ 256

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.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

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.