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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 3,071 $ 520
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization of fixed and intangible assets 5,403 4,762
Amortization of other long-term assets 1,200 967
Accretion of discounted liabilities 18 4
Amortization of deferred loan fees 81 59
Provision for bad debts 682 359
Loan principal and interest forgiveness (672)  
Stock-based compensation 1,792 1,357
Decrease in deferred income taxes (269) (910)
Change in fair value of an equity investment (1,066)  
Loss from equity method investment 13 13
Adjustment to bargain purchase gain on business acquisition 33  
Changes in assets and liabilities associated with operations:    
Increase in net receivables (30,422) (6,578)
Increase in inventories (9,615) (16,446)
Increase in prepaid expenses and other assets (1,052) (776)
(Increase) decrease in income tax receivable/payable, net 638 (597)
Decrease in net operating lease liability (18)  
Increase in accounts payable 2,293 1,617
Decrease in deferred revenue (11,293) (2,342)
Increase in accrued program costs 7,770 6,016
Decrease in other payables and accrued expenses (1,187) (2,094)
Net cash used in operating activities (32,600) (14,069)
Cash flows from investing activities:    
Capital expenditures (2,904) (2,980)
Intangible assets (41)  
Net cash used in investing activities (2,945) (2,980)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 35,900 19,400
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholdings) (2,454) (2,177)
Payment of cash dividends (593) (582)
Net cash provided by financing activities 32,853 16,641
Net decrease in cash and cash equivalents (2,692) (408)
Effect of exchange rate changes on cash and cash equivalents 534 (629)
Cash and cash equivalents at beginning of period 15,923 6,581
Cash and cash equivalents at end of period $ 13,765 $ 5,544