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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating losses $ 11,570 $ 8,004
Research and development credit carryforwards 3,246 3,104
Minimum tax credit carryforwards 0 31
Disallowed interest expense carryforwards 54 0
Stock compensation 258 168
Deferred revenue 148 588
Accrued expenses 590 349
Lease liabilities 1,931 1,905
Goodwill 0 2,132
Other 303 347
Gross current deferred tax assets 18,100 16,628
Valuation allowance (6,892) (5,204)
Net deferred tax assets 11,208 11,424
Deferred tax liabilities:    
Acquired intangibles (5,930) (7,828)
Fixed assets (284) (125)
Capitalized software (1,524) (1,353)
Deferred commission (1,000) (698)
Right-of-use asset (1,721) (1,756)
Goodwill (1,637) 0
Gross noncurrent deferred tax assets (12,096) (11,760)
Net deferred liabilities $ (888) $ (336)