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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES:      
Net income $ 7,092 $ 5,974  
Income from discontinued operations   (1,194)  
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 7,449 6,539  
Stock based compensation 550 516  
Amortization of deferred commissions 2,159 2,121  
Provision for doubtful accounts 288 2  
Deferred income taxes 500 433  
Loss (gain) on non-marketable equity investments 11 (54)  
Non-cash royalty expense (3,440)    
Change in fair value of non-marketable equity investments (1,152)   $ 1,300
Other 47 (28)  
Changes in operating assets and liabilities:      
Accounts and unbilled receivables (4,573) 1,387  
Prepaid royalties (3,202) (2,820)  
Other prepaid expenses and other current assets 735 251  
Deferred commissions (1,602) (1,382)  
Other assets 134 (16)  
Accounts payable and accrued expenses (5,775) (5,386)  
Accrued royalties 442 3,342  
Deferred revenue 6,453 6,400  
Net cash provided by operating activities 6,116 16,085  
INVESTING ACTIVITIES:      
Business combinations, net of cash acquired (21,421) (18,002)  
Proceeds from maturities of marketable securities 20,725 28,337  
Purchases of marketable securities (14,130) (30,101)  
Payments to acquire non-marketable equity investments   (3,342)  
Payments associated with capitalized software development (4,068) (4,933)  
Purchases of property and equipment (1,010) (11,338)  
Net cash used in investing activities (19,904) (39,379)  
FINANCING ACTIVITIES:      
Proceeds from exercise of stock options   31  
Taxes paid related to net settlement of equity awards (373) (359)  
Payments of earn-outs related to acquisitions   (37)  
Repurchase of common stock (9,876)    
Payment of cash dividends (30) (52)  
Net cash used in financing activities (10,279) (417)  
Effect of exchange rate changes on cash and cash equivalents (46)    
Net decrease in cash and cash equivalents (24,113) (23,711)  
Cash and cash equivalents at beginning of period 131,538 134,321  
Cash and cash equivalents at end of period $ 107,425 $ 110,610 $ 134,321