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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (2,021) $ (8,567)
Adjustments to reconcile net loss from operations to net cash provided by (used in) operations:    
Depreciation and amortization of intangible assets 6,097 5,734
Loss on disposal of assets 53  
Deferred tax benefit (319) (349)
Stock-based compensation 2,210 1,229
Changes in operating assets and liabilities:    
Accounts receivable, net 7,528 (8,788)
Inventories, net 3,376 (5,792)
Contract assets (2,026) 4,703
Accounts payable (5,025) 4,448
Income taxes payable (5,870) (6,139)
Accrued expenses (791) (4,269)
Deferred compensation 13 (332)
Deferred revenue 2,990 (1,758)
Other assets and liabilities (1,834) (2,913)
Net cash provided by (used in) operating activities 4,381 (22,793)
Cash flows from investing activities:    
Purchase of short term investments (14,645) (12,829)
Maturities of short term investments 13,340 9,500
Additions to property and equipment (2,167) (989)
Other (48)  
Net cash used in investing activities (3,520) (4,318)
Cash flows from financing activities:    
Tax payments for restricted stock issuances (1,179) (266)
Net cash used in financing activities (1,179) (266)
Effect of exchange rate changes on cash 20 (205)
Net decrease in cash (298) (27,582)
Cash, cash equivalents, and restricted cash, beginning of period 85,129 77,555
Cash, cash equivalents, and restricted cash, end of period [1] $ 84,831 $ 49,973
[1] The following table provides a reconciliation of cash, cash equivalents and restricted cash shown above to amounts reported within the unaudited condensed consolidated balance sheet as of June 30, 2020 and December 31, 2019 and amounts previously reported within the unaudited condensed consolidated balance sheet in our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2019 (in thousands):