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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss from operations $ (15,836) $ (2,021)
Adjustments to reconcile net loss from operations to net cash provided by (used in) operations:    
Depreciation and amortization of intangible assets 4,582 6,097
Loss on disposal of assets 19 53
Deferred tax benefit (2,194) (319)
Stock-based compensation 2,634 2,210
Changes in operating assets and liabilities:    
Accounts receivable, net 11,021 7,528
Inventories, net 3,585 3,376
Contract assets 1,974 (2,026)
Accounts payable 1,280 (5,025)
Income taxes payable (2,652) (5,870)
Accrued expenses 3,660 (791)
Deferred compensation (1,031) 13
Deferred revenue (931) 2,990
Other assets and liabilities (4,927) (1,834)
Net cash provided by operating activities 1,184 4,381
Cash flows from investing activities:    
Purchase of short term investments (32,253) (14,645)
Maturities of short term investments 16,100 13,340
Additions to property and equipment (1,208) (2,167)
Other (17) (48)
Net cash used in investing activities (17,378) (3,520)
Cash flows from financing activities:    
Repurchase of common stock (2,908)  
Tax payments for restricted stock issuances (2,230) (1,179)
Net cash used in financing activities (5,138) (1,179)
Effect of exchange rate changes on cash (511) 20
Net decrease in cash (21,843) (298)
Cash, cash equivalents, and restricted cash, beginning of period 89,241 85,129
Cash, cash equivalents, and restricted cash, end of period [1] 67,398 84,831
Supplemental cash flow disclosures:    
Restricted Cash $ 900 $ 800
[1] End of period cash, cash equivalents, and restricted cash includes $0.9 million and $0.8 million of restricted cash at June 30, 2021 and June 30, 2020, respectively.