Income Tax - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets (“DTA”)
Allowance for doubtful accounts	$ 175	$ 223
Unearned income	10,475	11,058
Lease liability	2,655	3,410
Share-based compensation	1,181	1,163
Debt issuance costs	132	189
Accrued liabilities	3,263	1,828
Derivative liability	1,036	2,070
Accrual of contract maintenance cost	84	110
Impairment of asset	290	310
Other	1,596	1,649
Total gross deferred tax assets	20,887	22,010
Deferred tax liabilities (“DTL”)
Capitalized salaries	2,193	2,095
Difference between the assigned values and the tax basis of assets and liabilities recognized in business combinations	7,978	10,507
Right of use asset	2,707	3,340
Other	3,468	3,086
Total gross deferred tax liabilities	16,346	19,028
Deferred tax asset (liability), net	$ 4,541	$ 2,982