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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement of Cash Flows [Abstract]    
Restricted cash $ 331  
Cash flows from operating activities:    
Net loss (7,983) $ (26,576)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Stock-based compensation 6,072 7,189
Depreciation 7,300 4,809
Amortization of intangible assets 4,692 4,988
Non-cash interest expense and amortization of convertible debt issuance costs 1,773 1,678
Deferred income taxes 327 (214)
Income (Loss) from Equity Method Investments (212) (81)
Loss from disposal of property, plant and equipment 0 98
Change in fair value of earn-out liability (1,800) 0
Change in operating assets and liabilities, net of impact of acquisitions:    
Accounts receivable (325) 7,372
Unbilled receivables 41,321 44,181
Prepaid expenses and other assets 1,854 (1,153)
Inventories 238 (1,370)
Accounts payable 416 2,171
Accrued salaries and benefits and other liabilities (7,966) (4,699)
Increase (decrease) in income taxes payable (4,069) (3,939)
Deferred revenue (1,826) (3,571)
Increase (decrease) in operating lease liabilities (2,978) (2,284)
Net cash provided by operating activities 37,258 28,761
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,950) (664)
Purchases of marketable securities (169,866) (131,601)
Maturities of marketable securities 215,164 130,772
Settlement of working capital adjustment from disposal of business (1,131) 0
Net cash provided by (used in) investing activities 42,217 (1,493)
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 4,005 4,856
Payments of taxes on restricted stock units (7,218) (3,786)
Payments under installment payment arrangement (2,551) (1,240)
Net cash used in financing activities (5,764) (170)
Effect of exchange rate changes on cash and cash equivalents (452) 0
Net increase in cash, cash equivalents and restricted cash 73,259 27,098
Cash, cash equivalents and restricted cash at beginning of period 102,518 116,252
Cash, cash equivalents and restricted cash at end of period 175,777 143,350
Non-cash investing and financing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 33,190 $ 6,828