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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 9,935 $ 3,071
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization of fixed and intangible assets 5,230 5,403
Amortization of other long-term assets 1,173 1,200
Loss on disposal of property, plant and equipment 77  
Accretion of discounted liabilities and deferred loan fees 75 99
Provision for bad debts 494 682
Loan principal and interest forgiveness   (672)
Fair value adjustment of contingent consideration 599  
Stock-based compensation 1,563 1,792
Decrease in deferred income taxes 207 (269)
Change in fair value of an equity investment (83) (1,066)
Other   46
Net foreign currency adjustment (261) 194
Changes in assets and liabilities associated with operations:    
Increase in net receivables (33,660) (30,482)
Increase in inventories (11,738) (9,615)
Increase in prepaid expenses and other assets (800) (1,052)
Decrease in income tax receivable/payable, net 3,046 638
Decrease in net operating lease liability (67) (18)
Increase in accounts payable 9,677 2,223
Decrease in customer prepayments (44,528) (11,293)
Increase in accrued program costs 24,601 7,770
Increase (decrease) in other payables and accrued expenses 2,145 (1,187)
Net cash used in operating activities (32,315) (32,536)
Cash flows from investing activities:    
Capital expenditures (3,294) (2,904)
Proceeds from disposal of property, plant and equipment 54  
Intangible assets (1,010) (41)
Net cash used in investing activities (4,250) (2,945)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 46,000 35,900
Net receipt from the issuance of common stock under ESPP 436 340
Net receipt from the exercise of stock options   67
Payment for tax withholding on stock-based compensation awards (2,174) (2,861)
Repurchase of common stock (6,219)  
Payment of cash dividends (594) (592)
Net cash provided by financing activities 37,449 32,854
Net increase (decrease) in cash and cash equivalents 884 (2,627)
Effect of exchange rate changes on cash and cash equivalents 672 469
Cash and cash equivalents at beginning of period 16,285 15,923
Cash and cash equivalents at end of period $ 17,841 $ 13,765