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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:          
Net income (loss) $ 11,166 $ (9,140) $ 8,553 $ (15,679)  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:          
Stock-based compensation     13,799 12,779  
Depreciation     12,753 15,447  
Amortization of intangible assets 4,700 4,600 9,284 9,276  
Non-cash interest expense and amortization of convertible debt issuance costs     3,775 3,571  
Deferred income taxes     1,317 53  
Loss on equity investment     453 318  
Loss on disposal of property, plant and equipment     0 2  
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     (10,827) 8,841  
Unbilled receivables     51,463 79,842  
Prepaid expenses and other assets     4,688 1,726  
Inventories     6,414 (1,468)  
Accounts payable     1,715 1,709  
Accrued salaries and benefits and other liabilities     (3,575) (2,030)  
Income taxes payable     (9,747) (8,643)  
Deferred revenue     2,190 (1,106)  
Operating lease liabilities     (1,203) (3,565)  
Net cash provided by operating activities     91,052 99,273  
Cash flows from investing activities:          
Purchases of property, plant, and equipment     (5,267) (12,780)  
Purchases of marketable securities     (333,782) (487,521)  
Maturities of marketable securities     260,924 407,556  
Proceeds from sale of marketable securities     174,546 2,496  
Settlement of working capital adjustment from disposal of business     0 (1,131)  
Net cash provided by (used in) investing activities     96,421 (91,380) $ (97,600)
Cash flows from financing activities:          
Proceeds received from issuance of common stock under employee stock plans     4,186 7,880  
Payments of taxes on restricted stock units     (8,486) (7,663)  
Payments under installment payment arrangements     (7,168) (6,600)  
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program     (100,068) 0  
Net cash used in financing activities     (111,536) (6,383)  
Effect of exchange rate changes on cash and cash equivalents     (168) (419)  
Net increase in cash, cash equivalents and restricted cash     75,769 1,091  
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 $ 205,093 $ 103,609 205,093 103,609 $ 129,324
Non-cash investing and financing activities during the period:          
Property, plant and equipment received and accrued in accounts payable and other liabilities     $ 10,720 $ 26,354