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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 204,731 $ 128,967
Marketable securities 272,382 373,682
Accounts receivable 38,730 27,903
Unbilled receivables 144,546 138,813
Inventories 8,052 14,466
Prepaids and other current assets 10,544 15,881
Total current assets 678,985 699,712
Intangible assets, net 27,203 36,487
Goodwill 183,222 183,222
Property, plant and equipment, net 50,058 57,693
Operating lease right-of-use assets 25,801 28,708
Deferred tax assets 3,907 4,353
Unbilled receivables 179,503 236,699
Other assets 4,306 4,535
Total assets 1,152,985 1,251,409
Current liabilities:    
Accounts payable 8,975 8,993
Accrued salaries and benefits 15,878 23,326
Deferred revenue 12,299 10,198
Income taxes payable 19,754 20,064
Operating lease liabilities 6,722 4,724
Other current liabilities 17,798 18,559
Total current liabilities 81,426 85,864
Convertible notes 159,806 156,031
Long-term operating lease liabilities 31,104 34,305
Long-term income taxes payable 31,853 41,333
Deferred tax liabilities 15,147 14,276
Other long-term liabilities 3,061 6,894
Total liabilities 322,397 338,703
Commitments and contingencies (Notes 9, 11 and 15)
Stockholders’ equity:    
Convertible preferred stock, $.001 par value: Authorized: 5,000,000 shares; Issued and outstanding: no shares at June 30, 2021 and December 31, 2020 0 0
Common stock, $.001 par value: Authorized: 500,000,000 shares; Issued and outstanding: 108,897,295 shares at June 30, 2021 and 111,697,994 shares at December 31, 2020 109 112
Additional paid-in capital 1,257,075 1,270,426
Accumulated deficit (426,413) (357,751)
Accumulated other comprehensive loss (183) (81)
Total stockholders’ equity 830,588 912,706
Total liabilities and stockholders’ equity $ 1,152,985 $ 1,251,409