SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 01, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Recently issued accounting pronouncements
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Retained earnings			$ 133,018		$ 122,713
Revenue Recognition
Unearned revenues			4,600		3,800
Cash payment received			5,200
Revenues recognized that was included in the deferred revenue balance			4,400
Trade accounts receivable
Allowance for doubtful accounts			1,800		$ 1,200
Development services contract
Revenue Recognition
Transaction price allocated to unsatisfied performance obligation			6,700
Fixed fee contract
Revenue Recognition
Transaction price allocated to unsatisfied performance obligation			$ 18,800
Fixed fee contract | Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue Recognition
Expected timing to recognize revenue, term			1 year
Fixed fee contract | Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue Recognition
Expected timing to recognize revenue, term			5 years
Cumulative Effect, Period of Adoption, Adjustment
Recently issued accounting pronouncements
Retained earnings	$ 300
State Enterprise | Revenues
Summary of Significant Accounting Policies
Prior period reclassification adjustment		$ (8,000)		$ (15,400)
State Enterprise | Cost of revenues
Summary of Significant Accounting Policies
Prior period reclassification adjustment		(7,200)		(13,900)
Software & services | Revenues
Summary of Significant Accounting Policies
Prior period reclassification adjustment		8,000		15,400
Software & services | Cost of revenues
Summary of Significant Accounting Policies
Prior period reclassification adjustment		$ 7,200		$ 13,900