INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Stock-based compensation	$ 983	$ 1,156
Federal benefit of state uncertain tax positions	746	954
Accrued vacation	521	550
Deferred rent	95	81
State net operating loss carryforwards	228	272
Allowance for doubtful accounts	311	240
Right of use lease liability	2,840
Other	465	662
Gross deferred tax assets	6,189	3,915
Less: Valuation allowance	(335)	(367)
Total deferred tax assets	5,854	3,548
Deferred tax liabilities:
Property and equipment	(2,027)	(1,834)
Capitalized software development costs	(3,544)	(2,495)
Right of use lease asset	(2,746)
Total deferred tax liabilities	(8,317)	(4,329)
Net deferred tax (liability) asset	$ 2,463	$ 781