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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:          
Net income (loss) $ 3,676 $ (12,737) $ 12,229 $ (28,416)  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:          
Stock-based compensation     21,281 19,613  
Depreciation     19,623 21,675  
Amortization of intangible assets 4,200 4,600 13,456 13,848  
Non-cash interest expense and amortization of convertible debt issuance costs     5,702 5,394  
Deferred income taxes     1,939 569  
Loss on equity investment     717 521  
Gain on disposal of property, plant and equipment     (48) (83)  
Change in fair value of earn-out liability 0 0 0 (1,800)  
Change in operating assets and liabilities, net of impact of acquisitions:          
Accounts receivable     (16,258) 11,014  
Unbilled receivables     87,335 122,498  
Prepaid expenses and other assets     5,910 2,114  
Inventories     6,506 (4,132)  
Accounts payable     1,007 1,063  
Accrued salaries and benefits and other liabilities     (7,626) (5,067)  
Income taxes payable     (21,414) (13,317)  
Deferred revenue     9,670 3,003  
Operating lease liabilities     (2,980) (5,105)  
Net cash provided by operating activities     137,049 143,392  
Cash flows from investing activities:          
Purchases of property, plant, and equipment     (7,527) (20,799)  
Purchases of marketable securities     (419,073) (655,063)  
Maturities of marketable securities     297,759 527,971  
Proceeds from sale of marketable securities     227,045 2,948  
Settlement of working capital adjustment from disposal of business     0 (1,131)  
Acquisition of businesses, net of cash acquired     (97,115) 0  
Net cash provided by (used in) investing activities     1,089 (146,074) $ (97,600)
Cash flows from financing activities:          
Proceeds received from issuance of common stock under employee stock plans     5,002 8,083  
Payments of taxes on restricted stock units     (9,953) (8,785)  
Payments under installment payment arrangements     (9,826) (9,152)  
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program     (100,081) 0  
Net cash used in financing activities     (114,858) (9,854)  
Effect of exchange rate changes on cash and cash equivalents     (362) (157)  
Net increase (decrease) in cash, cash equivalents and restricted cash     22,918 (12,693)  
Cash, cash equivalents and restricted cash at beginning of period     129,324 102,518 102,518
Cash, cash equivalents and restricted cash at end of period $ 152,242 $ 89,825 152,242 89,825 $ 129,324
Non-cash investing and financing activities during the period:          
Property, plant and equipment received and accrued in accounts payable and other liabilities     $ 11,809 $ 28,986  
Common stock issued pursuant to acquisition     6,978 0